drivers: sensor: explorir_m: increase max response delay

The sensor does not always finish responding within 200 ms.
This is the sometimes the case when using the sensor calibrate command `X`.
Response delay up to 212 ms has been measured with a logic analyzer.

Increase the max response delay to 300 ms to fix the issue.

Signed-off-by: Jeppe Odgaard <jeppe.odgaard@prevas.dk>