MT#55307 add drop index if exist `method_callid_idx`

* cleanup potential leftover of method_callid_idx in
  kamailio.acc that was created by the "wrong order"
  issue where 15761.up (replicated) was applied first
  (by replication) and then 15739_not_replicated.up
  was applied afterwards (with ngcp-update-db-schema)
* this solves the mr10.5.x to mr11.5.x upgrade scenario

Change-Id: I0c8dc07d84e2fc5134b7f7a05212d07bb41f031c
(cherry picked from commit ed2d3006b9)

db_scripts/diff/15784_not_replicated.down

@@ -0,0 +1 @@
+SET sql_log_bin=0;

db_scripts/diff/15784_not_replicated.up

@@ -0,0 +1,5 @@
+SET sql_log_bin=0;
+USE kamailio;
+
+DROP INDEX IF EXISTS `method_callid_idx` ON acc;
+