Improve group vars vault usage for kanboard

Signed-off-by: Florian Pritz <bluewind@xinu.at>

group_vars/all/vault_kanboard.yml

 $ANSIBLE_VAULT;1.1;AES256
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roles/kanboard/tasks/main.yml

@@ -24,7 +24,7 @@
     - data
 
 - name: create kanboard db user
-  postgresql_user: name={{ kanboard_db_user }} password={{ kanboard_db_password }} encrypted=true
+  postgresql_user: name={{ kanboard_db_user }} password={{ vault_kanboard_db_password }} encrypted=true
   become: yes
   become_user: postgres
   become_method: su

roles/kanboard/templates/config.php.j2

@@ -2,7 +2,7 @@
 
 define('DB_DRIVER', 'postgres');
 define('DB_USERNAME', '{{kanboard_db_user}}');
-define('DB_PASSWORD', '{{kanboard_db_password}}');
+define('DB_PASSWORD', '{{vault_kanboard_db_password}}');
 define('DB_HOSTNAME', 'localhost');
 define('DB_NAME', '{{kanboard_db}}');