Fix current_operation value in OpenAIR Valve

[ricklambrechts]

The installation fails with the latest version of the OpenAIR Valve yaml.

/config/esphome/bathroom-open-air-valve.yaml: In lambda function:
/config/esphome/bathroom-open-air-valve.yaml:139:38: error: 'VALVE_OPERATION_OPEN' was not declared in this scope
  139 |           id(air_valve).current_operation = VALVE_OPERATION_OPEN;
      |                                      ^~~~~~~~~~~~~~~~~~~~
Compiling .pioenvs/bathroom-open-air-valve/efuse/src/esp_efuse_fields.c.o
Compiling .pioenvs/bathroom-open-air-valve/efuse/src/esp_efuse_utility.c.o
/config/esphome/bathroom-open-air-valve.yaml: In lambda function:
/config/esphome/bathroom-open-air-valve.yaml:147:38: error: 'VALVE_OPERATION_CLOSED' was not declared in this scope
  147 |           id(air_valve).current_operation = VALVE_OPERATION_CLOSED;
      |                                      ^~~~~~~~~~~~~~~~~~~~~~

This is introduced with the latest update c407a78#diff-8616e4862930b609ac6527161afa91c7f4893fbef2a403a169ca002d9e8ee517.

Fixed based on the https://esphome.io/components/valve/ documentation.