Fix mask_write_register call. (#685)

Co-authored-by: Veaceslav MACARI <vmacari@otosense.com>

Author: vmacari

pymodbus/repl/client/mclient.py

@@ -270,7 +270,7 @@ def mask_write_register(self, address=0x0000,
         :param unit: The slave unit this request is targeting
         :return:
         """
-        resp = super(ExtendedRequestSupport, self).read_input_registers(
+        resp = super(ExtendedRequestSupport, self).mask_write_register(
             address=address, and_mask=and_mask, or_mask=or_mask, **kwargs)
         if not resp.isError():
             return {