tests/check/elements/audioconvert.c: interpret the out[] buffer in the order the bytes are actually put in, which is ...

Original commit message from CVS:

* tests/check/elements/audioconvert.c: (verify_convert),
(GST_START_TEST):
interpret the out[] buffer in the order the bytes are actually
put in, which is LITTLE_ENDIAN, not BYTE_ORDER.
Other tests should use BYTE_ORDER since the array is filled in
with actual values