Don't send dice / dart to channels.

Fixes #7703.

Telegram/SourceFiles/history/view/media/history_view_dice.cpp

@@ -42,6 +42,7 @@ namespace {
 			.durationMs = Ui::Toast::kDefaultDuration * 2,
 			.multiline = true,
 		};
+		if (history->peer->canWrite()) {
 			auto link = Ui::Text::Link(
 				tr::lng_about_random_send(tr::now).toUpper());
 			link.entities.push_back(
@@ -58,6 +59,7 @@ namespace {
 				}
 				return false;
 			});
+		}
 		Ui::Toast::Show(config);
 	});
 }