Update content description of active mode icon in Status Bar

It's now "<Mode name> is on" rather than simply "<Mode name>".

Fixes: 370427935
Test: atest PhoneStatusBarPolicyTest + manual
Flag: android.app.modes_ui
Change-Id: I71b43508a5b99f5a87e6e4c21a6db2566328a78e
3 files changed