(js) Fix email reminder with attendees

Fixes #4115

UI/WebServerResources/js/Scheduler/Component.service.js

@@ -689,16 +689,6 @@
     return (this.occurrenceId && this.userHasRSVP);
   };
 
-  /**
-   * @function isReadOnly
-   * @memberof Component.prototype
-   * @desc Check if the component is not editable and not an invitation
-   * @returns true or false
-   */
-  Component.prototype.isReadOnly = function() {
-    return (this.isReadOnly && !this.userHasRSVP);
-  };
-
   /**
    * @function enablePercentComplete
    * @memberof Component.prototype