Update to ng/gogs.css to fix line number spacing

Issue with viewing source code in firefox, line numbers do not match up with displayed line numbers, this can be fixed by setting the line height to 20px

public/ng/css/gogs.css

@@ -1420,6 +1420,7 @@ The register and sign-in page style
 }
 .code-view .lines-code > pre > ol.linenums > li {
   padding: 0 10px;
+  line-height: 20px;
 }
 .code-view .lines-code > pre > ol.linenums > li.active {
   background: #ffffdd;