remove useless rule

Author: silverwind

web_src/less/themes/theme-arc-green.less

@@ -268,11 +268,6 @@ a.ui.basic.green.label:hover {
   background-color: #a0cc75;
 }
 
-.ui.button:hover {
-  background-color: var(--color-secondary);
-  color: #dbdbdb;
-}
-
 .ui.search > .results {
   background: #383c4a;
   border-color: var(--color-secondary);