Remove use of old theme name.

Change-Id: I2940c2f5c062354c8f22f495c1718fdfd521715b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 7fd9c76..2370653 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -107,7 +107,7 @@
 
         <activity android:name="SelectCalendarsActivity" android:label="@string/calendars_title" />
         <activity android:name="CalendarSettingsActivity" android:label="@string/preferences_title"
-            android:theme="@android:style/Theme.Light.Holo"/>
+            android:theme="@android:style/Theme.Holo.Light"/>
 
         <!-- Declarations for search -->
         <!-- Make all activities a searchable context -->