dmap: use X_IS... rather than IS_X...

The libdmapsharing library mistakenly exported IS_DMAP... symbols,
whereas GObject introspection expects DMAP_IS... The library has since
fixed this, and this commit modifies grilo-plugins to follow suit.

Signed-off-by: W. Michael Petullo <mike@flyn.org>
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00:13:45