Coverity #111405: out-of-bounds overrun

Coverity #111405: out-of-bounds overrun

584 __wt_timestamp_to_string(
585 multi->page_las.unstable_timestamp,
586 ts_string[0], sizeof(ts_string));

CID 111405 (#1 of 1): Out-of-bounds access (OVERRUN)
3. overrun-buffer-arg: Overrunning array ts_string[1] of 48 bytes by passing it to a function which accesses it at byte offset 71 using argument 48UL. [show details]