Save Code context menu option does not save the solution if a filename is selected

The "Save Code" context menu option does not actually save any code. This is caused by:

AvaloniaILSpy/ILSpy.Core/Commands/SaveCodeContextMenuEntry.cs

Lines 106 to 110 in 4147e8c

    
           string filename = await dlg.ShowAsync(MainWindow.Instance); 
        
           if (filename != null) 
        
           { 
        
               return null; 
        
           }

Thus, if the user selects a filename to save the solution under, this code simply returns null, as if the user had cancelled the saving. If the user does indeed cancel the saving, this goes on to attempt what it should be doing when the user selects a filename. Thus, I suggest this check be changed to filename == null rather than filename != null.

	string filename = await dlg.ShowAsync(MainWindow.Instance);
	if (filename != null)
	{
	return null;
	}