id3: Drop trailing NULs from frames.
id3: Drop trailing NULs from frames.

Picard 1.3.2 appears to insert a trailing NUL at the end of
frames, resulting in taglib appending a trailing space
(after splitting frames on NUL and then joining with
spaces). Trim trailing NULs before splitting to prevent this
from occurring.

derat/taglib-go