Use PorterDuff instead of BlendMode for ColorFilter

Commit dadf251 (Change I119a7f57) moved default color filters from
PorterDuff to BlendMode. The latter are not supported by layoutlib, so
this moves them back to PorterDuff.

Bug: 74062470
Test: layoutlib tests
Change-Id: I0f2ca10388fd870ea542291fe44cf04cbce220b7
1 file changed