Fix giant egg which showed up in Subtitles sidebar in MacOS 14.0 Sono…

…ma (#4640)

Changes RoundedColorWell to use bounds instead of dirtyRect, which
should be much more reliable, and gets rid of the egg.

iina/RoundedColorWell.swift

@@ -18,7 +18,7 @@ class RoundedColorWell: NSColorWell {
   }
 
   override func draw(_ dirtyRect: NSRect) {
-    let circleRect = NSInsetRect(dirtyRect, 3, 3)
+    let circleRect = NSInsetRect(bounds, 3, 3)
 
     // darker if is pressing mouse button
     if self.isMouseDown {