Remove vendor prefixes in CSS

src/components/upnextdialog/upnextdialog.css

@@ -11,7 +11,6 @@
     background-color: rgba(0, 0, 0, 0.7);
     color: #fff;
     user-select: none;
-    -webkit-touch-callout: none;
 }
 
 .upNextDialog-hidden {
@@ -67,8 +66,4 @@
     border: 0;
     user-drag: none;
     user-select: none;
-    -moz-user-select: none;
-    -webkit-user-drag: none;
-    -webkit-user-select: none;
-    -ms-user-select: none;
 }