Updates js-utils (pruning the word list). (#5371)

package.json

     "jquery-contextmenu": "2.4.5",
     "jquery-i18next": "1.2.1",
     "js-md5": "0.6.1",
-    "js-utils": "github:jitsi/js-utils#7a2be83d17dc4a3d0fac4a742ab999478f326f2e",
+    "js-utils": "github:jitsi/js-utils#91c5e53ca5fa42907c88d56bc78254e6e56e058d",
     "jsrsasign": "8.0.12",
     "jwt-decode": "2.2.0",
     "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#5466c9d08a2c262ebb5889e3bb0cbbe6f08dc0c3",