Check for sc2k save file doesn't run the function

[Michiel Sikma]

See the following line:

https://github.com/rage8885/OpenSC2K/blob/aca518c4814e85050661125053ace69f0cd3e280/js/import.js#L94

This does not actually call the isSimCity2000SaveFile() function, so the statement always concludes it's a valid save file.

[Mike]

This can be closed now @rage8885 @msikma