Settings 'app.db' destination folder is enough

This prevents the bug where 'app.db' was copied twice.

roles/calibre-web/tasks/main.yml

@@ -63,7 +63,7 @@
 - name: Provision calibre-web with default administration settings.
   copy:
     src: roles/calibre-web/files/app.db
-    dest: "{{ calibreweb_config }}/{{ calibreweb_settings_database }} "
+    dest: "{{ calibreweb_config }}"
     owner: "{{ calibreweb_user }}"
     group: "{{ apache_user }}"
     mode: 0644