Revert "sep-12: DELETE /customer should return 204 (not 200) on succe…

…ss (#92)" (#93)

This reverts commit e1033ee.

@stellar/anchor-tests/src/tests/sep12/deleteCustomer.ts

@@ -127,7 +127,7 @@ const canDeleteCustomer: Test = {
         },
       ),
     };
-    await makeRequest(deleteCustomerCall, 204, result);
+    await makeRequest(deleteCustomerCall, 200, result);
     return result;
   },
 };