Fixes: U4-4405 List view icons are broken in firefox

src/Umbraco.Web.UI.Client/src/less/listview.less

@@ -172,8 +172,7 @@
 }
 
 .table-striped tbody input[type="checkbox"] {
-  display: block;
-  position: absolute;
+  display: none;
   top: 10px;
   left:10px;
   z-index: 5;
@@ -181,7 +180,6 @@
 
 .table-striped tbody i {
   display: block;
-  position: absolute;
   top: 10px;
   left:6px;
   padding: 0 0 0 4px;

src/Umbraco.Web.UI.Client/src/views/propertyeditors/listview/listview.html

@@ -44,7 +44,7 @@
         <table class="table table-striped">
             <thead>
                 <tr>
-                    <td>
+                    <td style="width: 35px">
                         <input type="checkbox" ng-click="selectAll($event)" ng-checked="isSelectedAll()"></td>
                     <td><a href="#" ng-click="sort('Name')" prevent-default>
                         <localize key="general_name">Name</localize>