Removed ContentTemplate bindings in MenuItem
Removed ContentTemplate bindings in MenuItem

As ContentTemplate doesn't exist on MenuItem.

SuperJMN/Avalonia,SuperJMN/Avalonia,akrisiun/Perspex,OronDF343/Avalonia,jkoritzinsky/Avalonia,jkoritzinsky/Avalonia,susloparovdenis/Avalonia,Perspex/Perspex,punker76/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,jkoritzinsky/Avalonia,MrDaedra/Avalonia,AvaloniaUI/Avalonia,susloparovdenis/Avalonia,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,jkoritzinsky/Avalonia,wieslawsoltes/Perspex,SuperJMN/Avalonia,jkoritzinsky/Avalonia,wieslawsoltes/Perspex,wieslawsoltes/Perspex,wieslawsoltes/Perspex,jazzay/Perspex,SuperJMN/Avalonia,wieslawsoltes/Perspex,SuperJMN/Avalonia,jkoritzinsky/Avalonia,susloparovdenis/Perspex,OronDF343/Avalonia,SuperJMN/Avalonia,jkoritzinsky/Perspex,grokys/Perspex,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,SuperJMN/Avalonia,MrDaedra/Avalonia,jkoritzinsky/Avalonia,Perspex/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,susloparovdenis/Perspex,grokys/Perspex