[Plot] Wait for width before loading

Plot waits for element to have width before loading.  Otherwise,
it may make a minmax request with an invalid size parameter.

Fixes https://github.com/nasa/openmct/issues/1974

platform/commonUI/general/src/ui/TreeLabelView.js

@@ -40,18 +40,10 @@ define([
         return type.getCssClass();
     }
 
-    function removePreviousIconClass(el) {
-        $(el).removeClass(function (index, className) {
-            return (className.match (/\bicon-\S+/g) || []).join(' ');
-        });
-    }
-
     TreeLabelView.prototype.updateView = function (domainObject) {
         var titleEl = this.el.find('.t-title-label'),
             iconEl = this.el.find('.t-item-icon');
 
-        removePreviousIconClass(iconEl);
-
         titleEl.text(domainObject ? domainObject.getModel().name : "");
         iconEl.addClass(domainObject ? getClass(domainObject) : "");