Add account_validity's email_sent column to the list of boolean columns in synapse_port_db

Fixes #5306

scripts/synapse_port_db

@@ -54,6 +54,7 @@ BOOLEAN_COLUMNS = {
     "group_roles": ["is_public"],
     "local_group_membership": ["is_publicised", "is_admin"],
     "e2e_room_keys": ["is_verified"],
+    "account_validity": ["email_sent"],
 }