Let external kalamar port default to 80

This works also on the test server (compute)
diff --git a/korap4dnb-compose.yml b/korap4dnb-compose.yml
index 0d5883d..bbb88f1 100644
--- a/korap4dnb-compose.yml
+++ b/korap4dnb-compose.yml
@@ -5,7 +5,7 @@
   kalamar:
     image: "korap/kalamar:dnb"
     ports:
-      - "64543:64543"
+      - "80:64543"
     environment:
       KALAMAR_API: "http://kustvakt:8089/api/"
     depends_on: