Try to load colors more frequently

During OTA, sysprops aren't available as early in the boot process.
This causes the boot animation to not have dynamic colors.

This CL tries to load the colors more frequently, at every part loop.
Before we'd only try on the first frame of each animation part.

Test: adb shell bootanimation
Fixes: 229029861
Change-Id: I1bbebf93b4fbc31d945c4181472576cf29f13bc7