fix: correct Strapi database configuration structure

The database config had an incorrect nested structure with
connection.client.connection which caused Strapi to fail with
'Cannot destructure property client of db.config.connection'.

Fixed to use the correct flat structure:
connection.client, connection.host, etc.

cms/cms/config/database.ts

@@ -11,15 +11,13 @@ export default ({ env }) => {
   if (client === 'postgres') {
     return {
       connection: {
-        client,
+        client: 'postgres',
-        connection: {
         host: env('DATABASE_HOST', 'localhost'),
         port: env.int('DATABASE_PORT', 5432),
         database: env('DATABASE_NAME', 'strapi'),
         user: env('DATABASE_USERNAME', 'strapi'),
         password: env('DATABASE_PASSWORD', 'strapi'),
         ssl: env.bool('DATABASE_SSL', false),
-        },
         pool: { min: 2, max: 10 },
       },
     };
@@ -27,10 +25,8 @@ export default ({ env }) => {
 
   return {
     connection: {
-      client,
+      client: 'sqlite',
-      connection: {
       filename: path.join(__dirname, '..', '..', env('DATABASE_FILENAME', '.tmp/data.db')),
-      },
       useNullAsDefault: true,
     },
   };