Fixes #140490 by always using cursor:text on macOS instead of our c…

…ustom cursor. Since macOS Catalina the native cursor has a white border which makes it work well on dark themes, making our custom cursor not necessary. Also, macOS High Sierra is no longer officially supported by Apple (ref #96946)

src/vs/base/browser/ui/mouseCursor/mouseCursor.css

@@ -6,9 +6,3 @@
 .monaco-mouse-cursor-text {
 	cursor: text;
 }
-
-/* The following selector looks a bit funny, but that is needed to cover all the workbench and the editor!! */
-.vs-dark .mac .monaco-mouse-cursor-text, .hc-black .mac .monaco-mouse-cursor-text,
-.vs-dark.mac .monaco-mouse-cursor-text, .hc-black.mac .monaco-mouse-cursor-text {
-	cursor: -webkit-image-set(url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAL0lEQVQoz2NgCD3x//9/BhBYBWdhgFVAiVW4JBFKGIa4AqD0//9D3pt4I4tAdAMAHTQ/j5Zom30AAAAASUVORK5CYII=') 1x, url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAQAAADZc7J/AAAAz0lEQVRIx2NgYGBY/R8I/vx5eelX3n82IJ9FxGf6tksvf/8FiTMQAcAGQMDvSwu09abffY8QYSAScNk45G198eX//yev73/4///701eh//kZSARckrNBRvz//+8+6ZohwCzjGNjdgQxkAg7B9WADeBjIBqtJCbhRA0YNoIkBSNmaPEMoNmA0FkYNoFKhapJ6FGyAH3nauaSmPfwI0v/3OukVi0CIZ+F25KrtYcx/CTIy0e+rC7R1Z4KMICVTQQ14feVXIbR695u14+Ir4gwAAD49E54wc1kWAAAAAElFTkSuQmCC') 2x) 5 8, text;
-}