Fix Taskbar separator sometimes disappearing (#10113)

* fix separator sometimes disappearing

* change to min-width

src/sql/base/browser/ui/taskbar/media/taskbar.css

@@ -74,7 +74,7 @@
 }
 
 .taskbarSeparator {
-	width: 1px;
+	min-width: 1px;
 	background-color:#A5A5A5;
 	margin: 6px 8px;
 }