Change Uploader activity to exclude the backstack task from recents

AndroidManifest.xml

@@ -72,7 +72,8 @@
         </activity>
         <activity android:name=".ui.activity.UploadFilesActivity" />
         <activity android:name=".ui.activity.Uploader"
-                  android:launchMode="singleInstance">
+                  android:launchMode="singleInstance"
+                  android:excludeFromRecents="true">
             <intent-filter>
                 <action android:name="android.intent.action.SEND" />