Use type instead of isAccount flag

postgres/queries/payees.sql

@@ -10,7 +10,7 @@ WHERE payees.budget_id = $1
 ORDER BY name;
 
 -- name: SearchPayees :many
-SELECT payees.* FROM payees 
+SELECT payees.*, 'payee' as type FROM payees 
 WHERE payees.budget_id = @budget_id
 AND payees.name LIKE @search
 ORDER BY payees.name;