Hard dependency for debian-server on toolbox.

It's already setup anyway by the playbook, so make it a hard dependency.

debian_server.yaml

@@ -5,4 +5,3 @@
     - ns4
   roles:
     - debian_server
-    - toolbox

roles/debian_server/meta/main.yml

+---
+galaxy_info:
+  author: Nimrod Adar
+  company: Shore
+  description: Debian server
+  license: MIT
+  min_ansible_version: 2.10
+  platforms:
+    - name: Debian
+      versions:
+        - Buster
+dependencies:
+  - role: toolbox