Fix buttons left-margin (#11427)

Co-authored-by: Lauris BH <lauris@nix.lv>

web_src/less/_repository.less

@@ -2869,7 +2869,7 @@ td.blob-excerpt {
     overflow: hidden;
 }
 
-.ui .right .ui.button {
+.ui.form .right .ui.button {
     margin-left: .25em;
     margin-right: 0;
 }