Modify the value that checks for invalid values

Signed-off-by: Hunsup Jung <hunsup.jung@samsung.com>

src/app/clusters/thermostat-server/thermostat-server.cpp

@@ -438,7 +438,7 @@ MatterThermostatClusterServerPreAttributeChangedCallback(const app::ConcreteAttr
         }
         auto RequestedSystemMode = static_cast<SystemModeEnum>(*value);
         if (ControlSequenceOfOperation > ControlSequenceOfOperationEnum::kCoolingAndHeatingWithReheat ||
-            RequestedSystemMode > SystemModeEnum::kFanOnly)
+            RequestedSystemMode > SystemModeEnum::kSleep)
         {
             return imcode::InvalidValue;
         }