Revert "Fix: for LDAP auth when user credentials are invalid (#407)"

Does not pass current tests :/

This reverts commit 7e0f460d9e.

frontend/mixins/shared.js

@@ -92,7 +92,7 @@ const funcs = {
       })
     },
     is(role) {
-      return this.$store.state?.user?.role == role
+      return this.$store.state.user.role == role
     },
     can(permissions) {
       return this.$store.getters.hasPermissions(permissions)