Bug 1220309 - Correct all caps button text in Button from AppCompat. r=sebastian

AppCompat capitalizes all text in `Button`s so we have to override
that behavior to maintain the same UI. Ideally, we do this through
`android:buttonStyle` but the place I found the issue doesn't inherit
from that style so we can't and we change the style directly.

There may be issues with other `Button`s, but this is the only one I found.

--HG--
extra : commitid : JWDZBWuhsYy
extra : rebase_source : 534d09ceca6d15bfd1ad49772ee0f3bfad4751c1

mobile/android/base/resources/values/styles.xml

@@ -841,6 +841,9 @@
         <item name="android:paddingBottom">16dp</item>
         <item name="android:paddingLeft">8dp</item>
         <item name="android:paddingRight">8dp</item>
+
+        <!-- AppCompat sets Button text to all caps so we override that here. -->
+        <item name="textAllCaps">false</item>
     </style>
 
     <style name="TabQueueActivity" parent="android:style/Theme.NoDisplay" />