MS5837 console calibration options and code cleanup

[vtHydroponics]

Description:

Related issue (if applicable): fixes #

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.0.241030
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[vtHydroponics]

A question for the MS5837 calibration via the console... I need a value to be persistently stored for the pressure offset to be retained between resets. Automatic recalibration of the pressure offset would not be possible due to the requirement of both sensors to be at the same elevation for calibration. Thank you.

[arendst]

What's the size of the value (uint8_t, uint16_t, uint32_t, int) - keep it as small as possible?

[arendst]

Chks fail due to my error. Fixing now.

[vtHydroponics]

the size of the value is a 4 byte float

[arendst]

Use variable Settings->ms5837_pressure_offset