[Glitch] Enable ESLint no-useless-escape

Port db2c58d47a to glitch-soc

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

app/javascript/flavours/glitch/actions/push_notifications/registerer.js

@@ -6,7 +6,7 @@ import { setBrowserSupport, setSubscription, clearSubscription } from './setter'
 const urlBase64ToUint8Array = (base64String) => {
   const padding = '='.repeat((4 - base64String.length % 4) % 4);
   const base64 = (base64String + padding)
-    .replace(/\-/g, '+')
+    .replace(/-/g, '+')
     .replace(/_/g, '/');
 
   const rawData = window.atob(base64);