Fixed: Fix disabling obfuscation added in 6ef2618 caused due to wrong proguard file being used.

This caused Termux classes like `ReportInfo` to be obfuscated making stacktraces harder to read.

```
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.termux/com.termux.shared.activities.ReportActivity}: android.os.BadParcelableException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = I0.a)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3864)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4006)
	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:111)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2462)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:240)
	at android.os.Looper.loop(Looper.java:351)
	at android.app.ActivityThread.main(ActivityThread.java:8377)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)
Caused by: android.os.BadParcelableException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = I0.a)
	at android.os.Parcel.readSerializableInternal(Parcel.java:5113)
	at android.os.Parcel.readValue(Parcel.java:4655)
	at android.os.Parcel.readValue(Parcel.java:4363)
	at android.os.Parcel.-$$Nest$mreadValue(Unknown Source:0)
	at android.os.Parcel$LazyValue.apply(Parcel.java:4461)
	at android.os.Parcel$LazyValue.apply(Parcel.java:4420)
	at android.os.BaseBundle.getValueAt(BaseBundle.java:394)
	at android.os.BaseBundle.getValue(BaseBundle.java:374)
	at android.os.BaseBundle.getValue(BaseBundle.java:357)
	at android.os.BaseBundle.getValue(BaseBundle.java:350)
	at android.os.BaseBundle.getSerializable(BaseBundle.java:1451)
	at android.os.Bundle.getSerializable(Bundle.java:1144)
	at com.termux.shared.activities.ReportActivity.updateUI(ReportActivity.java:136)
	at com.termux.shared.activities.ReportActivity.onCreate(ReportActivity.java:89)
	at android.app.Activity.performCreate(Activity.java:8397)
	at android.app.Activity.performCreate(Activity.java:8370)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1403)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3837)
	... 12 more
Caused by: java.lang.ClassNotFoundException: I0.a
	at java.lang.Class.classForName(Native Method)
	at java.lang.Class.forName(Class.java:536)
	at android.os.Parcel$2.resolveClass(Parcel.java:5090)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1733)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1624)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1902)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1442)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:430)
	at android.os.Parcel.readSerializableInternal(Parcel.java:5096)
	... 29 more
Caused by: java.lang.ClassNotFoundException: I0.a
	... 38 more
```

Related commit termux/termux-app@da3a0ac4

Author: agnostic-apollo

app/build.gradle

@@ -35,7 +35,7 @@ android {
         release {
             minifyEnabled true
             shrinkResources false // Reproducible builds
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
         }
 
         debug {