Fix UnsupportedOperationException in Display Settings

Remove android:textColorHint from Theme.Settings to fix the regression.

This is a quick fix, each EditText should set its hintTextColor
attribute before there is a fix to apply the attribute globally in
Settings APP.

Bug: 188405076
Test: manually launch 'Font size' and 'Display size'.
Change-Id: If3313be47e0c3e8ce9d41a6e87cdf2e7067ce54b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 61c0c4e..a2bd129 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -677,7 +677,8 @@
         <activity android:name=".localepicker.LocalePickerWithRegionActivity"
                   android:excludeFromRecents="true"
                   android:configChanges="orientation|keyboardHidden|screenSize"
-                  android:exported="false">
+                  android:exported="false"
+                  android:theme="@style/Theme.LocalePickerWithRegionActivity">
         </activity>
 
         <activity