Fix custom reactions in channels.

Telegram/SourceFiles/data/data_message_reactions.cpp

@@ -181,6 +181,13 @@ PossibleItemReactionsRef LookupPossibleReactions(
 			}
 			return true;
 		});
+		for (const auto &id : allowed.some) {
+			if (!added.contains(id)) {
+				if (const auto temp = reactions->lookupTemporary(id)) {
+					result.recent.push_back(temp);
+				}
+			}
+		}
 		result.customAllowed = (allowed.type == AllowedReactionsType::All)
 			&& premiumPossible;
 	}