🐛 Fix styles hiding highlightparent plugin

plugin filename had typo, when z-index: -1 was removed from dokuwiki__content::before side-effects
on highlightparent weren't checked

css/area_content.less

@@ -27,16 +27,6 @@
                 clear: both;
                 padding-top: 1em; // as h1
             }
-
-            #plugin__highlightparent {
-                clear: none;
-                display: block;
-
-                + * {
-                    clear: both;
-                    padding-top: 1em; // as h1
-                }
-            }
         }
     }
 }