Fix Talkback speak pages for "Wallpapers/Basic colors" tab

- Current design we have setup pages of color options for each tab,
  so we don't need to announce color section's view pager. Disable its
  announcement to fix that.
- Video:
  https://drive.google.com/file/d/1OmlFbFIRTsW_6x5Od_wLfgeaBloHnyrm/

Bug: 219863524
Test: manual
Change-Id: Ib0d33ccbb2b57c7d233cdcc635d43f7ebea50f7f