Merging ub-launcher3-qt-dev, build 5570425

Test: Manual

Bug:129154138 In paged views inside ThemePicker, difficult to swipe left and right due to gesture nav
Bug:132340681 [Clarification] Not seeing Style and Clock under Styles & wallpapers screen
Bug:132641260 Update the Wallpaper section to match spec
Change-Id: Ic0d035e28a4b2b2ef2a4777d5eed2c41b7937671