Fix opening the file actions menu in mobile

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

apps/files/css/files.scss

@@ -493,6 +493,7 @@ table td.selection {
 .fileactions {
 	position: absolute;
 	right: 0;
+	z-index: 50;
 }
 
 .busy .fileactions, .busy .action {

apps/files/css/mobile.scss

@@ -46,12 +46,6 @@ table td.filename .nametext {
 #fileList a.action-share span:not(.icon) {
 	display: none !important;
 }
-#fileList a.action.action-favorite {
-	opacity: .7 !important;
-}
-#fileList a.action.action-favorite {
-	opacity: .3 !important;
-}
 
 /* ellipsis on file names */
 table td.filename .nametext .innernametext {