Fix getstyle, again

Fix getstyle, again

As reported by Paul Seelig, it used to be the case that

getstyle -t ~/GNUstep/Library/WindowMaker/Themes/somefile

would save the current theme, and all old menus (WMRootMenu) were
relying on this.

The problem was that the following piece (from commit 6bf79945)

	if (style_file && !make_pack)
		print_help(0, 1);

would allow a style_file to be specified and saved to only with the
option -p (which implies make_pack), therefore saving a theme with
-t like the root menu used to do no longer worked.

Now things work fine:

[mafra@Pilar:~]$ ls GNUstep/
Applications/  Apps/  Defaults/  Library/
[mafra@Pilar:~]$ getstyle -t ~/GNUstep/theme
[mafra@Pilar:~]$ ls GNUstep/
Applications/  Apps/  Defaults/  Library/  theme

But also note that trying to save a theme outside of GNUstep/
is not allowed and it prints no error message - perhaps it should...