disable JIT and parallel execution for osm2pgsql updates again

The gazetteer output doesn't disable these functions when
writing to the place table but the triggers may contain
operations that cause misplanning for the query planner.

nominatim/tools/exec_utils.py

@@ -127,6 +127,9 @@ def run_osm2pgsql(options):
         if param in dsn:
             cmd.extend(('--' + param, dsn[param]))
 
+    if options.get('disable_jit', False):
+        env['PGOPTIONS'] = '-c jit=off -c max_parallel_workers_per_gather=0'
+
     cmd.append(str(options['import_file']))
 
     subprocess.run(cmd, cwd=options.get('cwd', '.'), env=env, check=True)