We renamed externalid to icpcid.

Author: nickygerritsen

webapp/src/Service/ImportExportService.php

@@ -829,7 +829,7 @@ protected function importTeamsJson(array $data, string &$message = null): int
             $teamData[] = [
                 'team' => [
                     'teamid' => $team['id'],
-                    'externalid' => $team['icpc_id'] ?? null,
+                    'icpcid' => $team['icpc_id'] ?? null,
                     'categoryid' => $team['group_ids'][0] ?? null,
                     'name' => @$team['name'],
                     'display_name' => @$team['display_name'],