grid 去除选中单元格边框

frontend/saas-web/app/Application.scss

@@ -297,6 +297,10 @@ body.launching {
   border-color: #ABDAFF;
 }
 
+.x-keyboard-mode  .x-grid-item-focused .x-grid-cell-inner:before {
+  border: none;
+}
+
 .x-grid-item-over {
   background-color: #bde5f7;
 }