fix(ui): z-index of the shui select content

resources/css/shui.css

@@ -219,7 +219,7 @@ html[data-theme=dark] {
 
 .ui__dialog-overlay, .ui__alert-dialog-overlay,
 .ui__dialog-content, .ui__alert-dialog-content,
-.ui__dropdown-menu-content {
+.ui__dropdown-menu-content, .ui__select-content {
   &.z-50 {
     @apply z-[999];
   }