Remove duplicated progress reporting during heap scan of VACUUM

This has been introduced by c16dc1a since progress reporting for VACUUM
has been added.  As this issue just causes some extra work and is
harmless, no backpatch is done.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20191213030831.GT2082@telsasoft.com

src/backend/access/heap/vacuumlazy.c

@@ -1445,8 +1445,6 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats,
 		pgstat_progress_update_multi_param(2, hvp_index, hvp_val);
 
 		/* Remove tuples from heap */
-		pgstat_progress_update_param(PROGRESS_VACUUM_PHASE,
-									 PROGRESS_VACUUM_PHASE_VACUUM_HEAP);
 		lazy_vacuum_heap(onerel, vacrelstats);
 		vacrelstats->num_index_scans++;
 	}