[Glitch] Enable ESLint no-useless-escape

Port db2c58d47a to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/utils/hashtag.js

@@ -1,6 +1,6 @@
 export function recoverHashtags (recognizedTags, text) {
   return recognizedTags.map(tag => {
-    const re = new RegExp(`(?:^|[^\/)\w])#(${tag.name})`, 'i');
+    const re = new RegExp(`(?:^|[^/)\w])#(${tag.name})`, 'i');
     const matched_hashtag = text.match(re);
     return matched_hashtag ? matched_hashtag[1] : null;
   },