[IMP] fix the issue of account_analytic_plan migration in v17

Should be great to understand the origin of the problem one day...

18.0/pre_upgrade.sh

@@ -6,7 +6,10 @@ echo "Prepare migration to 18.0..."
 copy_database ou17 ou18 ou18 || exit 1
 
 # Execute SQL pre-migration commands
-PRE_MIGRATE_SQL=""
+PRE_MIGRATE_SQL=$(cat <<'EOF'
+UPDATE account_analytic_plan SET default_applicability=NULL WHERE default_applicability='optional';
+EOF
+)
 echo "SQL command = $PRE_MIGRATE_SQL"
 query_postgres_container "$PRE_MIGRATE_SQL" ou18 || exit 1