Fix unescaped space.

Author: joewreschnig

man/mid3v2.1

@@ -28,7 +28,7 @@ embedded binary data.
 Delete ID3v2 tags.
 .IP \-s,\ \-\-delete\-v1
 Delete ID3v1 tags.
-.IP \-D, \-\-delete-all
+.IP \-D,\ \-\-delete-all
 Delete all ID3 tags.
 .IP \-C,\ \-\-convert
 Convert ID3v1 tags to ID3v2 tags. This will also happen automatically