fixes incorrect scrollbar display issue (#7742)

* fixes incorrect scrollbar override issue

Here the CSS for scrollbar-width is overriding the CSS which is defined in the main.css file (--scrollbar-width: calc(var(--font-size) * 0.6);) due to which the scrollbars are incorrectly loaded in the application

* keep the scrollbars thin for macos

---------

Co-authored-by: gatzjames <jamesgatzos@gmail.com>

Author: Karthik7406

packages/insomnia/src/ui/css/styles.css

@@ -12,7 +12,8 @@
 @tailwind components;
 @tailwind utilities;
 
-* {
+
+[data-platform="darwin"] * {
   scrollbar-width: thin;
 }