fix issue for migration

meta/main.yml

@@ -1,4 +1,3 @@
 dependencies: 
           - nginx
-          - php 
-          - mariadb
+          - php 

tasks/database_postgres.yml

@@ -13,6 +13,7 @@
     name: "{{ ttrss_db_name }}"
     lc_collate: fr_FR.UTF-8
     encoding: utf8
+    template: template0
     owner: "{{ ttrss_db_user }}"
     state: present
   register: ttrss_database_creation