Fix several conversation settings feedback issues.

* Mute icon in wrong location in RTL
* No exit animation when dismissing conversation settings
* Thumbnails flicker when you come back to conversation settings
* Rounded corners for mute dialog don't match other dialogs
* Mute button in note-to-self conversation settings
* Explore adding contact details to the contact bottom sheet

app/src/main/res/values-v21/themes.xml

@@ -65,5 +65,6 @@
     </style>
 
     <style name="Signal.ConversationSettings.WindowAnimation" parent="android:style/Animation" >
+        <item name="android:windowExitAnimation">@anim/slide_fade_to_bottom</item>
     </style>
 </resources>