Fix cuetag for media-libs/flac-1.2.1

https://bugs.gentoo.org/show_bug.cgi?id=327271

Patch written by Alexander Kozyrev <sequoiahead@gmail.com>
--- a/extras/cuetag.sh
+++ b/extras/cuetag.sh
@@ -18,7 +18,7 @@
 {
 	# FLAC tagging
 	# --remove-vc-all overwrites existing comments
-	METAFLAC="metaflac --remove-vc-all --import-vc-from=-"
+	METAFLAC="metaflac --remove-all-tags --import-tags-from=-"
 
 	# Ogg Vorbis tagging
 	# -w overwrites existing comments