update version of LtSpiceToLatex()

[Steffen-W]

I had made some small improvements in Steffen-W/Convert_LTspice_to_Latex. Your version currently differs little from mine. Only the deletion of the created file at the end in LtSpiceToLatex() does not exist.

if save is not True:
  os.remove(saveFile)

Otherwise you should be able to use the code without any problems.