Round values to only one decimal for Xiaomi Aqara sensors

[covrig]

Description:

The manufactures states the accuracy below. For this reason two decimals is a bit too much and I kindly suggest to round the value to one decimal. This will also make the text a bit more visible in the top badges.
Temperature detection range: -20 - 60 Deg.C ( + / - 0.3 Deg.C )
Humidity detection range: 0 - 100pct RH ( + / - 0.3pct )
Atmospheric pressure detection range: 30 - 110KPa ( + / - 120Pa )

Checklist:

• [x ] The code change is tested and works locally.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.io

If the code communicates with devices, web services, or third-party tools:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

[homeassistant]

Hi @covrig,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[Danielhiversen]

👍