luci-theme-material: fix button position on modal save

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

themes/luci-theme-material/htdocs/luci-static/material/cascade.css

@@ -1673,10 +1673,6 @@ body:not(.Interfaces) .cbi-rowstyle-2:first-child {
 	padding: .3rem .6rem;
 }
 
-.modal .spinning {
-	margin-bottom: 2em;
-}
-
 .modal.cbi-modal {
 	max-width: 90%;
 	max-height: none;