Support default ACL in a VPC

a vpc usually has a default acl
this makes sure that moto flags it
and that the describe response has it in there

moto/ec2/models.py

@@ -2610,10 +2610,12 @@ class NetworkAcl(TaggedEC2Resource):
         self.vpc_id = vpc_id
         self.network_acl_entries = []
         self.associations = {}
-        self.default = default
+        self.default = 'true' if default is True else 'false'
 
     def get_filter_value(self, filter_name):
-        if filter_name == "vpc-id":
+        if filter_name == "default":
+            return self.default
+        elif filter_name == "vpc-id":
             return self.vpc_id
         elif filter_name == "association.network-acl-id":
             return self.id

moto/ec2/responses/network_acls.py

@@ -96,7 +96,7 @@ DESCRIBE_NETWORK_ACL_RESPONSE = """
    <item>
      <networkAclId>{{ network_acl.id }}</networkAclId>
      <vpcId>{{ network_acl.vpc_id }}</vpcId>
-     <default>true</default>
+     <default>{{ network_acl.default }}</default>
      <entrySet>
        {% for entry in network_acl.network_acl_entries %}
          <item>