Fix: windowType not checked in InAppBrowser show function macOS

[dmeuwissen]

Connection with issue(s)

Resolve issue #1602

[pichillilorenzo]

That check isn't necessary, as it should always fall back to the CHILD window type.
I tested the TABBED window type, and it works as expected, so I don't understand what is the problem here.

[pichillilorenzo]

It seems that if you call the show() function too soon, for some reason, the NSApplication.shared.mainWindow?.tabbedWindows?.contains(self) or NSApplication.shared.mainWindow?.childWindows?.contains(self) will return false, so it will try to add again the Window causing the crash.

[dmeuwissen]

I personally execute the show() function tied to a button, making it unlikely that I am invoking it early. In my current scenario, I maintain multiple tabs. If the configuration is set for tabbed windows, it should logically prevent the possibility of entering the logic for a child window opening. The suggested modification should effectively address this issue.