libical-glib gtk-doc installed into a wrong directory

[Milan Crha]

	Hi,
I just realized that the libical-glib gtk-doc generated documentation
is installed in a wrong directory. Actually, it's a correct directory
   $PREFIX/share/gtk-doc/html/libical-glib/
but it adds also a html/ subfolder, thus it looks like:
   $PREFIX/share/gtk-doc/html/libical-glib/html/
instead of
   $PREFIX/share/gtk-doc/html/libical-glib/

The attached one-lines fixes this issue. I'm sorry I didn't notice it
when creating the initial changes with libical-glib upstreaming.
	Bye,
	Milan
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