system_monitor_service: add Tctl to the list of valid CPU temp labels

[LionHeartP]

Summary

Adds Tctl to the list of valid CPU temp labels

Motivation

On my system, I have no Tdie sensor. The fallback to any "CPU" label that exists can poll the wrong sensor resulting in 0C or invalid readings overall

❯ grep "" /sys/class/hwmon/hwmon*/temp*_label
/sys/class/hwmon/hwmon0/temp1_label:Composite
/sys/class/hwmon/hwmon1/temp1_label:Composite
/sys/class/hwmon/hwmon2/temp1_label:CPU
/sys/class/hwmon/hwmon2/temp2_label:System
/sys/class/hwmon/hwmon2/temp3_label:VRM MOS
/sys/class/hwmon/hwmon2/temp4_label:PCH
/sys/class/hwmon/hwmon2/temp5_label:CPU Socket
/sys/class/hwmon/hwmon2/temp6_label:PCIe x1
/sys/class/hwmon/hwmon2/temp7_label:M2_1
/sys/class/hwmon/hwmon3/temp1_label:edge
/sys/class/hwmon/hwmon3/temp2_label:junction
/sys/class/hwmon/hwmon3/temp3_label:mem
/sys/class/hwmon/hwmon4/temp1_label:edge
/sys/class/hwmon/hwmon5/temp1_label:Tctl
/sys/class/hwmon/hwmon5/temp3_label:Tccd1
/sys/class/hwmon/hwmon5/temp4_label:Tccd2

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Build / packaging

Testing

Manual Coverage

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Tested on another compositor:
• Tested with different bar positions and density settings
• Tested at different interface scaling values
• Tested with multiple monitors

Screenshots / Videos

Checklist

• This PR is ready for review
• I read and followed the relevant guidance in CONTRIBUTING.md.
• this PR has no code changes.
• I ran the relevant build or test commands, or explained why they were not run.
• I self-reviewed the changes.
• I checked for new warnings or errors.
• this PR does not change user-facing configuration or behavior.
• or this PR adds no new user-facing strings.
• I did not edit non-English translation files unless this PR is explicitly for translation tooling, an import/export sync, or a maintainer-requested locale change.
• I used the existing canonical names for config keys, IPC names, paths, and identifiers.

Additional Notes

[ItsLemmy]

Thanks for the PR and the report. As discussed on discord, I went another direction after gathering all the data.