Fix a calculation in TidStoreCreate().

Since we expect that the max_bytes is in bytes, not in kilobytes, it
should not be multiplied by 1024.

Introduced by 30e144287a.

Reported-by: John Naylor, David Rowley
Reviewed-by: John Naylor
Discussion: https://postgr.es/m/CANWCAZZTE-14ofsucofTuhFsfuDGBNf%3DNZb22TMYT8bxA41oQQ%40mail.gmail.com
Discussion: https://postgr.es/m/CAApHDvojg82NDaDEpj1WEZSbVTafj%3DDRmW%2BFrkBdW8ScL4OFxA%40mail.gmail.com

src/backend/access/common/tidstore.c

@@ -130,7 +130,7 @@ TidStoreCreate(size_t max_bytes, dsa_area *area, int tranche_id)
 	ts->context = CurrentMemoryContext;
 
 	/* choose the maxBlockSize to be no larger than 1/16 of max_bytes */
-	while (16 * maxBlockSize > max_bytes * 1024L)
+	while (16 * maxBlockSize > max_bytes)
 		maxBlockSize >>= 1;
 
 	if (maxBlockSize < ALLOCSET_DEFAULT_INITSIZE)