[LR11x0] Fix temperature reading

[mixeysan]

According LR1121 datasheet
Before:
11:35:15.753 -> 044E
11:35:15.753 -> -427058.1562500000
After:
12:14:17.348 -> 044E
12:14:17.348 -> 23.39

Pull request template

Thank you for taking the time to contribute to RadioLib development!
To keep this library organized, please follow these rules.

1. Make sure the the code in your PR is tested and that you understand all its impacts.
2. Ensure that all CI actions pass - PRs with failed CI will not be merged. CI actions run automatically for every commit pushed to the PR and test the following:
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   b. Runtime test on Raspberry Pi
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After addressing/accepting the points above, delete the contents of this template and replace it with text explaining what is the goal of your PR, why you want to add it to the upstream and what are the foreseen impacts. Once again, thank you for taking the time to contribute!

[jgromes]

Thank you for the contribution, it is appreciated and can be merged. However, next time, please try to explain what is the change actually achieving - commits titled "Update LR11x0.cpp" don't tell me anything about the nature of the change.