make details activity using default theme

AndroidManifest.xml

@@ -139,10 +139,7 @@
             </intent-filter>
         </receiver>
 
-        <activity
-            android:name=".ui.activity.FileDetailActivity"
-            android:theme="@style/Theme.ownCloud" >
-        </activity>
+        <activity android:name=".ui.activity.FileDetailActivity" />
         <activity android:name=".extensions.ExtensionsAvailableActivity"></activity>
         <activity android:name=".extensions.ExtensionsListActivity"></activity>
         <activity android:name=".ui.activity.AccountSelectActivity" android:uiOptions="none" android:label="@string/prefs_accounts"></activity>