The same test for REINDEX (VERBOSE) was done twice, while it is clear
that the second test should use --concurrently.  Issue introduced in
5dc92b84, for what looks like a copy-paste mistake.

Reviewed-by: Mark Dilger
Discussion: https://postgr.es/m/A7AE97EA-F4B0-4CAB-8FFF-3FECD31F9D63@enterprisedb.com
Backpatch-through: 12