Removed unnecessary full namespaces

AndroidManifest.xml

@@ -92,9 +92,9 @@
         <activity android:name=".ui.activity.PreferencesNewSessionewSession" >
         </activity>
         
-        <activity	android:name="com.owncloud.android.ui.preview.PreviewImageActivity" />
+        <activity	android:name=".ui.preview.PreviewImageActivity" />
 		        
-        <activity	android:name="com.owncloud.android.ui.preview.PreviewVideoActivity"
+        <activity	android:name=".ui.preview.PreviewVideoActivity"
 					android:label="@string/app_name"
 					android:theme="@style/Theme.ownCloud.Fullscreen" >
 		</activity>