Make the successfull task snackbar duration a bit shorter (about 2s

shorter). Helpful for two consecutive setting inputs, as you dont have
to wait.

app/src/main/java/org/transdroid/core/gui/DetailsActivity.java

@@ -356,7 +356,7 @@ public class DetailsActivity extends AppCompatActivity implements TorrentTasksEx
 		// Refresh the screen as well
 		refreshTorrent();
 		refreshTorrentDetails(torrent);
-		SnackbarManager.show(Snackbar.with(this).text(successMessage));
+		SnackbarManager.show(Snackbar.with(this).text(successMessage).duration(Snackbar.SnackbarDuration.LENGTH_SHORT));
 	}
 
 	@UiThread