fix(user/edit): escape parenthesis in input pattern (#823)

Author: derrabauke

addon/templates/users/edit.hbs

@@ -85,7 +85,7 @@
             name="phone"
             placeholder="{{t 'emeis.users.headings.phone-placeholder'}}"
             required={{includes "phone" this.requiredFields}}
-            pattern="^[0-9()\+\-\s]+$"
+            pattern="^[0-9\(\)\+\-\s]+$"
             value={{@model.phone}}
           />