[RDBMS] az postgres flexible-server create: set the default value of parameter --create-default-database to Disabled

Author: Matthew Boentoro

src/azure-cli/azure/cli/command_modules/rdbms/_params.py

@@ -330,7 +330,7 @@ def _flexible_server_params(command_group):
         create_default_db_arg_type = CLIArgumentType(
             arg_type=get_enum_type(['Enabled', 'Disabled']),
             options_list=['--create-default-database', '-c'],
-            help='Enable or disable the creation of default database flexibleserverdb. Default value is Enabled.'
+            help='Enable or disable the creation of default database flexibleserverdb. Default value is Disabled.'
         )
 
         cluster_option_arg_type = CLIArgumentType(
@@ -600,7 +600,7 @@ def _flexible_server_params(command_group):
                 c.argument('iops', default=None, arg_type=iops_v2_arg_type)
                 c.argument('throughput', default=None, arg_type=throughput_arg_type)
                 c.argument('performance_tier', default=None, arg_type=performance_tier_arg_type)
-                c.argument('create_default_db', default='Enabled', arg_type=create_default_db_arg_type)
+                c.argument('create_default_db', default='Disabled', arg_type=create_default_db_arg_type)
                 c.argument('create_cluster', default='Server', arg_type=cluster_option_arg_type)
                 c.argument('cluster_size', default=None, arg_type=create_node_count_arg_type)
             elif command_group == 'mysql':