chore: clean dead code in manifest

Author: Bambooin

app/src/main/AndroidManifest.xml

@@ -45,14 +45,6 @@
             </intent-filter>
             <meta-data android:name="android.view.im" android:resource="@xml/method" />
         </service>
-        <!--
-        <activity android:name="Pref" android:label="@string/ime_name">
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
-                <category android:name="android.intent.category.DEFAULT" />
-                <category android:name="android.intent.category.LAUNCHER" />
-            </intent-filter>
-        </activity> -->
 
         <!-- Settings activity -->
         <activity android:name=".settings.PrefMainActivity"