fix(lists): send requests for list membership

Fixes a regression in 0af8dbf, where
lists memberships where not saved, as the requests where not send to the
server.

mastodon/src/main/java/org/joinmastodon/android/fragments/ListsFragment.java

@@ -18,6 +18,7 @@
 import org.joinmastodon.android.E;
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.api.ResultlessMastodonAPIRequest;
 import org.joinmastodon.android.api.requests.lists.AddAccountsToList;
 import org.joinmastodon.android.api.requests.lists.CreateList;
 import org.joinmastodon.android.api.requests.lists.GetLists;
@@ -120,16 +121,16 @@ public void onError(ErrorResponse error) {
 	private void saveListMembership(String listId, boolean isMember) {
 		userInList.put(listId, isMember);
 		List<String> accountIdList = Collections.singletonList(profileAccountId);
-//		MastodonAPIRequest<Object> req = (MastodonAPIRequest<Object>) (isMember ? new AddAccountsToList(listId, accountIdList) : new RemoveAccountsFromList(listId, accountIdList));
-//		req.setCallback(new Callback<>() {
-//			@Override
-//			public void onSuccess(Object o) {}
-//
-//			@Override
-//			public void onError(ErrorResponse error) {
-//				error.showToast(getContext());
-//			}
-//		}).exec(accountID);
+		ResultlessMastodonAPIRequest req = isMember ? new AddAccountsToList(listId, accountIdList) : new RemoveAccountsFromList(listId, accountIdList);
+		req.setCallback(new Callback<>() {
+			@Override
+			public void onSuccess(Void o) {}
+
+			@Override
+			public void onError(ErrorResponse error) {
+				error.showToast(getContext());
+			}
+		}).exec(accountID);
 	}
 
 	@Override