Increase critical CPU temperature value

[DL6ER]

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How familiar are you with the codebase?: 10

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Change CPU temperature value when switching from green to red from 45 to 60°C. A normal working temperature for a Raspberry Pi (in a plastic case) is around 55°C. Hence, a lot of users (including me) always see the temperature icon in red. However, the Raspberry Pi can still operate fine at even higher temperatures (CPU frequency only gets throttled when surpassing 85°C).

From the Raspbery Pi FAQ:

8. WHAT IS ITS OPERATING TEMPERATURE?
   The Raspberry Pi is built from commercial chips which are qualified to different temperature ranges; the LAN9512 is specified by the manufacturers as being qualified from 0°C to 70°C, while the AP is qualified from -40°C to 85°C. You may well find that the board will work outside those temperatures, but we’re not qualifying the board itself to these extremes.

This template was created based on the work of udemy-dl.

[AzureMarker]

Approved

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/make-temperature-icon-threshold-a-user-configurable-setting/22566/3