Fix db drop and schema create commands with default_dbname option

Fixes #1783

Author: ostrolucky

src/Command/CreateDatabaseDoctrineCommand.php

@@ -66,7 +66,8 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         unset($params['dbname'], $params['path'], $params['url']);
 
         if ($connection->getDatabasePlatform() instanceof PostgreSQLPlatform) {
-            $params['dbname'] = 'postgres';
+            /** @psalm-suppress InvalidArrayOffset It's still available in DBAL 3.x that we need to support */
+            $params['dbname'] = $params['default_dbname'] ?? 'postgres';
         }
 
         $tmpConnection           = DriverManager::getConnection($params, $connection->getConfiguration());

src/Command/DropDatabaseDoctrineCommand.php

@@ -77,7 +77,8 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         unset($params['dbname'], $params['url']);
 
         if ($connection->getDatabasePlatform() instanceof PostgreSQLPlatform) {
-            $params['dbname'] = 'postgres';
+            /** @psalm-suppress InvalidArrayOffset It's still available in DBAL 3.x that we need to support */
+            $params['dbname'] = $params['default_dbname'] ?? 'postgres';
         }
 
         if (! $input->getOption('force')) {