Fix all RemoteInputView colors when isColorized changes.

* I made recent changes to isColorized logic which made this far wasier to test with the notify app.
* NotificationContentView wasn't updating the view enough, so that was fixed.
* Update the mBackgroundColor for non-colorized notifications, too, as this was causing the colorized color to be left around when removing colorization.
* Tint the cursor drawable instead of removing removint it, as this caused it to behave oddly when colorized, and to have the wrong color when removing colorization.
* Use codepaths that are as identical as possible across colorized/non-colorized to prevent more of these issues.

Bug: 182577304
Test: manual w/ notify app
Change-Id: I5190a37b4f41129a31102d40174d091a750d8f43