Extended text field for stream url across entire width of dialog

htdocs/index.html

@@ -282,7 +282,7 @@
         <div class="modal-body">
           <form role="form">
             <div class="row">
-              <div class="form-group col-md-9">
+              <div class="form-group col-md-12">
                 <label class="control-label" for="streamurl">Stream URL</label>
                 <input type="text" class="form-control" id="streamurl" />
               </div>