reverted unintended changes

resource/styles/scss/_wiki.scss

@@ -293,6 +293,14 @@ div.body {
   }
 }
 
+// mobile
+.page-mobile .wiki .revision-head {
+  .revision-head-link,
+  .revision-head-edit-button {
+    opacity: 0.3;
+  }
+}
+
 @media (max-width: $screen-sm-max) { // {{{ tablet and iphone size
   .main-container .main .wiki {
     img {