diffs: do not set incorrect display type on table TD

rhodecode/public/css/diff.less

@@ -32,13 +32,17 b' div.diffblock.margined.comm tr {'
     }
 
     .comment-toggle {
-        display: inline-block;
-        visibility: hidden;
         width: 20px;
         color: @rcblue;
+        .icon-comment{
+            display: inline-block;
+            visibility: hidden;
+        }
 
         &.active {
+            .icon-comment{
             visibility: visible;
+            }
             cursor: pointer;
         }
     }
@@ -87,4 +91,4 b' div.diffblock.margined.comm tr {'
         clear: both;
         font-family: @text-semibold;
     }
-}
  No newline at end of file
+}