test: reduce the ref/unref test runs to 256
test: reduce the ref/unref test runs to 256

Nothing special about 1000, 256 checks the 2-byte boundary and beyond that
we're just testing whether the computer can count. Let's assume it can.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

NoXPhasma/libratbag,libratbag/libratbag,whot/libratbag,NoXPhasma/libratbag,cvuchener/libratbag,cvuchener/libratbag,whot/libratbag,cvuchener/libratbag,whot/libratbag,libratbag/libratbag,libratbag/libratbag,NoXPhasma/libratbag