fix preste state null always when it conflicts with hvac modes

- Ensure the preset dp is the same hvac mode dp before check.

- The condition would ensure that if preset and hvac share same dp to not update preset mode if hvac changed. this made because if preset contains more hvac modes that aren't supported by HA would give user ability to change it otherwise state would be stuck to the latest one and would reqiure to change it to another one then back.

custom_components/localtuya/climate.py

@@ -357,7 +357,9 @@ def hvac_action(self):
     def preset_mode(self):
         """Return current preset."""
         mode = self.dp_value(CONF_HVAC_MODE_DP)
-        if mode in list(self._hvac_mode_set.values()):
+        if self._preset_dp == self._hvac_mode_dp and (
+            mode in list(self._hvac_mode_set.values())
+        ):
             return None
 
         return self._preset_mode