gen_library.sh: Only copy .ogg files

This excludes the invalid_track file I just added.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

tests/gen_library.sh

@@ -18,7 +18,7 @@ function tag_file()
 mkdir -p /tmp/ocarina/dir{1..5}
 
 for i in $(seq 5); do
-	cp tests/Music/* /tmp/ocarina/dir$i/
+	cp tests/Music/*.ogg /tmp/ocarina/dir$i/
 
 	for f in /tmp/ocarina/dir$i/*; do
 		tag_file $f $i