convert/svn: correctly encode deleted entry paths
This recode call was removed in
ede2247e61aa, because it looked the
encode(decode()) construct was a no-op. In fact, the first decode() call was
wrong, and entries still have to be encoded before being passed to the sink.
convert/svn: remove broken but unused copy filtering code
For some reason, if a copy source is deleted in the same revision it is
referenced, it is filtered out. This is silly, because this happens all the
time with move operations. Fortunately, the filtering code is buggy and ends
being a no-op 99% of the time, since it does not delete the right key. Just
remove all this nonsense.