Context menu fix

[ShadowFantasy]

The context menu would give the option to create a new spreadsheet when a file was selected. This would produce an error if the option was clicked because it would try to create a new spreadsheet using the file name which is not a directory.

I added an if statement that only gives the option when a directory is selected by checking if the "file" object in the event has a "children" property.

*Edit Now checks using "instanceof TFolder"