lib/azure_blob_req: fix Put Page opcode
lib/azure_blob_req: fix Put Page opcode

Incorrectly set to AOP_BLOB_PUT - the same members are freed on request
cleanup, so this was never seen to cause issues.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

ddiss/elasto,ddiss/elasto