Put plugin directly in <Image>File/Create

Don't put the plug in a "Python-Fu" sub-directory as it
slows down execution by requiring the user to navigate
yet another level in the menu hierarchy. Also the choice
of programming language a plugin was written in, is pretty
much irrelevant to a user running it.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

startrail.py

@@ -208,7 +208,7 @@ def startrail(frames, use_dark_frames, dark_frames, save_intermediate, save_dire
 	],
 	[],
 	startrail,
-	menu="<Image>/File/Create/Python-Fu",
+	menu="<Image>/File/Create",
 	domain=("gimp20-template", locale_directory)
 	)