[MacOS] fix quit menu item copy paste mistake
[MacOS] fix quit menu item copy paste mistake

AvaloniaUI/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,grokys/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,grokys/Perspex,SuperJMN/Avalonia,SuperJMN/Avalonia