Fix line selection on blame view (#12857)

Blame and regular code view have diverge slightly so line highlighting wasn't working properly anymore. Make work again in lieu of a larger refactor of blame HTML to move it outside of source and into templates to match code view.

Fixes #12836

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

web_src/less/_base.less

@@ -1122,7 +1122,7 @@ i.icon.centerlock {
     width: 100%;
   }
 
-  .lines-code.active {
+  .active {
     background: #fffbdd !important;
   }