[MFM] Fix emoji syntax parsing

src/mfm/parse/elements/emoji.ts

@@ -9,7 +9,7 @@ export type TextElementEmoji = {
 };
 
 export default function(text: string) {
-	const match = text.match(/^:([a-zA-Z0-9+-_]+):/);
+	const match = text.match(/^:([a-zA-Z0-9+-_]+?):/);
 	if (!match) return null;
 	const emoji = match[0];
 	return {