Do not use Paint.setFontVariationSettings as basis for variant Typefaces

Post cache eviction, it was possible to generate the wrong typeface
for an animation if the typeface was edited but not the font variation
settings as Paint.setFontVariationSettings would not. If the typeface
must be changed, reinitialization of the cache is also required.

Bug: 279877970
Test: Manually checked variant typeface generation
Change-Id: I5f76c0aa3d8aca7c1096c34c09b5861b980fe0ff