Set NSFunctionBarAPIEnabled to NO on Mac
Set NSFunctionBarAPIEnabled to NO on Mac

- I don't have a touch-bar enabled Mac, so don't know if this is still needed with the QtWebEngine port, but we were setting it in Cocoa so setting it here
- I did not port over the following WebKit settings that Cocoa RStudio was setting:
   "WebKitWebGLEnabled"
   "WebKitDeveloperExtras"
   "WebKitJavaScriptCanAccessClipboard"

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