Volume UI updates

- redline compliance
- a11y labeling
- hide setting icon if device isn't provisioned

Change-Id: I62e0da51879dc5f6e05ed814f2d9b6ee41e125a1
Fixes: 74152268
Fixes: 73963013
Fixes: 73902271
Test: manual inspection
Signed-off-by: Josh Fox (XlxFoXxlX) <joshfox87@gmail.com>
diff --git a/themes/darktheme/SysuiDarkThemeOverlay/res/values/styles.xml b/themes/darktheme/SysuiDarkThemeOverlay/res/values/styles.xml
index f85a13c..e9b7d8e 100644
--- a/themes/darktheme/SysuiDarkThemeOverlay/res/values/styles.xml
+++ b/themes/darktheme/SysuiDarkThemeOverlay/res/values/styles.xml
@@ -7,5 +7,6 @@
         <item name="android:colorAccent">@*android:color/accent_device_default_dark</item>
         <item name="android:colorControlNormal">?android:attr/textColorPrimary</item>
         <item name="android:colorBackgroundFloating">@*android:color/material_grey_900</item>
+        <item name="android:panelColorBackground">@*android:color/material_grey_800</item>
     </style>
 </resources>