remove rank column from managershalf

sql/corrections/teamshalf.sql

@@ -0,0 +1,7 @@
+begin;
+insert into teamshalf
+select yearid, null, teamid, half, null, null, "rank", sum(g), sum(w), sum(l)
+from managershalf
+where yearid = 1892
+group by yearid, teamid, half;
+commit;