fix: 🐛 remove transparent border for #mw-createaccount-join:hover

Signed-off-by: WaitSpring <me@waitspring.com>

skinStyles/mediawiki/special/mediawiki.special.userlogin.login.styles.less

@@ -60,7 +60,6 @@
 	color: var( --color-primary );
 
 	&:hover {
-		border-color: transparent;
 		background-color: var( --color-surface-2--hover );
 	}