ITS#7815 fix mdb_page_split

Was leaving cursor pointed at wrong page if the newindx was
in the right sibling page, and the parent was also split.

libraries/liblmdb/mdb.c

@@ -7857,12 +7857,10 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
 			 */
 			if (mn.mc_pg[ptop] != mc->mc_pg[ptop] &&
 				mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) {
-				for (i=0; i<ptop; i++) {
+				for (i=0; i<=ptop; i++) {
 					mc->mc_pg[i] = mn.mc_pg[i];
 					mc->mc_ki[i] = mn.mc_ki[i];
 				}
-				mc->mc_pg[ptop] = mn.mc_pg[ptop];
-				mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
 			}
 		}
 		/* return tmp page to freelist */