Exempt getUID() from ESLint's no-bitwise rule

[skip sauce]
[skip validator]

js/src/util.js

@@ -99,7 +99,9 @@ const Util = (($) => {
 
     getUID(prefix) {
       do {
+        /* eslint-disable no-bitwise */
         prefix += ~~(Math.random() * 1000000) // "~~" acts like a faster Math.floor() here
+        /* eslint-enable no-bitwise */
       } while (document.getElementById(prefix))
       return prefix
     },