Fix extra or missing newlines at end of file in our fish scripts

New fish_indent does that too, so this will make any future reformatting
diffs smaller.

Done using either of:

	perl -pi -e 'undef $/; s/\n*$/\n/' share/**.fish
	kak -n -f '<a-/>\n*<ret>d' share/**.fish

share/functions/__fish_is_first_token.fish

@@ -13,4 +13,3 @@ function __fish_is_first_token -d 'Test if no non-switch argument has been speci
     end
     return 0
 end
-