fix(client): リアクションのカスタム絵文字が表示されないことがあるのを修正

Fix #9683

packages/frontend/src/components/global/MkEmoji.vue

@@ -31,11 +31,11 @@ const useOsNativeEmojis = computed(() => defaultStore.state.emojiStyle === 'nati
 const url = computed(() => {
 	if (char.value) {
 		return char2path(char.value);
-	} else if (props.host == null) {
+	} else if (props.host == null && !customEmojiName.includes('@')) {
 		const found = customEmojis.find(x => x.name === customEmojiName);
 		return found ? found.url : null;
 	} else {
-		const rawUrl = `/emoji/${customEmojiName}@${props.host}.webp`;
+		const rawUrl = props.host ? `/emoji/${customEmojiName}@${props.host}.webp` : `/emoji/${customEmojiName}.webp`;
 		return defaultStore.state.disableShowingAnimatedImages
 			? getStaticImageUrl(rawUrl)
 			: rawUrl;