Updates PR and Addresses Console Error

THis commit imroves conditional rendering of the container groups form for
System Auditors.  It also removes a ng-class condition in the IG list that was unused.

awx/ui/client/lib/components/code-mirror/_index.less

@@ -52,12 +52,6 @@
     height: calc(~"100vh - 80px");
 }
 
-textarea[disabled] + div .CodeMirror-code{
-    background-color: #ebebeb;
-    cursor: not-allowed;
-}
-
-
 @media screen and (min-width: 768px){
 	.NetworkingExtraVars .modal-dialog{
 		width: 700px;