improve less formating - part 1 (plugin modules)

- remove @author from comments
- adjust the spacing

css/plugins/popupviewer.less

@@ -2,12 +2,9 @@
  * This file provides styles for popupviewer plugin
  */
 
-
 /* + + + + +  global  + + + + + */
-
 #popupviewer {
     > .controls > .content {
-
         padding: 1.5rem 1rem 1rem;
 
         td,
@@ -19,6 +16,7 @@
                 line-height: @line-height-default;
             }
         }
+
         .li,
         li {
             font-size: @font-size-default;