tools/: Use the string passed to g_option_context_new() for what it's intended for - the program name is already prin...

Original commit message from CVS:
* tools/gst-inspect.c: (main):
* tools/gst-launch.c: (main):
* tools/gst-run.c: (main):
* tools/gst-typefind.c: (main):
* tools/gst-xmlinspect.c: (main):
Use the string passed to g_option_context_new() for
what it's intended for - the program name is already
printed elsewhere.