SML: Allow larger offset when using x to ignore bytes

[dops-at]

Description:

STW Klagenfurt sends 355 bytes, and the interesting values starts somewhere at position 304. Therefor we need to set a larger uint range to allow more than 255 bytes to ignore.

Discussion open -> https://github.com/arendst/Tasmota/discussions/21359

Checklist:

• [x] The pull request is done against the latest development branch
• [x] Only relevant files were touched
• [x] 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.2.7.6
• [x] The code change is tested and works with Tasmota core ESP32 V.3.0.0
• [x] I accept the CLA.

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

[s-hadinger]

If there is no reason to force 16 bits, you can use uint32_t instead. It makes the code smaller