image_upload_widget: Remove blue outline when clicking.

"Upload profile picture" and similar text shown when hovering
over the image shows a blue outline while clicking on it
and same blue outline is shown when clicking on the delete
button ("x") as well. This commit updates the CSS to remove
that outline.

web/styles/image_upload_widget.css

@@ -46,6 +46,10 @@
         right: 10px;
         z-index: 99;
         line-height: 20px;
+
+        &:focus:not(:focus-visible) {
+            outline: none;
+        }
     }
 
     .image-disabled-text {
@@ -93,6 +97,10 @@
         position: absolute;
         z-index: 99;
         visibility: hidden;
+
+        &:focus:not(:focus-visible) {
+            outline: none;
+        }
     }
 
     .image-upload-text:hover {