Change on/off values for Force Bold Text

Use On = 300 and Off = 0. Rename setting.

Bug: b/170966021, b/110991537
Test: builds and toggle works, atest
FontWeightAdjustmentPreferenceControllerTest

Change-Id: Icf5d15fc26266578ad78bae5b6f80d193e63c82d
3 files changed