dzsave.c: Remove trailing comma from IIIFv3 folder names (#2590)
dzsave.c: Remove trailing comma from IIIFv3 folder names (#2590)

Fixes #2589.

Signed-off-by: Aaron <d033e22ae348aeb5660fc2140aec35850c4da997@datahoarder.dev>
lovell/libvips,lovell/libvips,lovell/libvips,lovell/libvips