tag: fix typo in ID3 genres

psychadelic -> psychedelic. Spotted by Sébastien Wilmet.

https://bugzilla.gnome.org/show_bug.cgi?id=647399

gst-libs/gst/tag/gstid3tag.c

@@ -109,7 +109,7 @@ static const gchar *genres[] = {
   "Native American",
   "Cabaret",
   "New Wave",
-  "Psychadelic",
+  "Psychedelic",
   "Rave",
   "Showtunes",
   "Trailer",
@@ -135,7 +135,7 @@ static const gchar *genres[] = {
   "Avantgarde",
   "Gothic Rock",
   "Progressive Rock",
-  "Psychadelic Rock",
+  "Psychedelic Rock",
   "Symphonic Rock",
   "Slow Rock",
   "Big Band",