Fix Talkback announcing null when changing color option

Move the Talkback announcement for options from OptionSelectorController to GridFragment. We only need this logic for grid option and it's hard to understand with the color option without title.

Videos:
 -Before: https://drive.google.com/file/d/1-tFBWwz_SjbenpmAozPhlC7dRRFHiDkN/view?usp=sharing&resourcekey=0-SLo4PJEo3G3J0O_LVYSd7A
 -After: https://drive.google.com/file/d/1-XTa--g59Dw_HXxm5SjofE2nxlBWDhtY/view?usp=sharing&resourcekey=0-e9mS5uqltrAR3zyXS8cUqQ
 -After GridFragment: https://drive.google.com/file/d/11sDHACAOSU4npMao_4f-NUKUje3fZlfj/view?usp=sharing&resourcekey=0-8Pm0qkzvLilSMhpzUBWr6A

Bug: 210801885
Test: Manual
Change-Id: If47204681655f42741a2e46e2d585144a7d08711