Fix color picker apply button

Fix how apply button text is binded. Also make sure apply button is
disabled when no new option is selected. In addition, disable apply
button text animation to ensure it is less distracting and has better
contrast when going from the disabled to enabled state.

Flag: com.android.systemui.shared.new_customization_picker_ui
Test: manually verified
Bug: 363018910
Bug: 350718581
Change-Id: Ifde133ada8ecac7a87bbab0faf10323f510a954f