Remove dead InRecovery check.

With the new B-tree incomplete split handling in 9.4, _bt_insert_parent is
never called in recovery.

src/backend/access/nbtree/nbtinsert.c

@@ -1740,7 +1740,6 @@ _bt_insert_parent(Relation rel,
 		{
 			BTPageOpaque lpageop;
 
-			if (!InRecovery)
 			elog(DEBUG2, "concurrent ROOT page split");
 			lpageop = (BTPageOpaque) PageGetSpecialPointer(page);
 			/* Find the leftmost page at the next level up */