Don't duplicate coretemp sensor readings

[modelrockettier]

Fixes #1708

@karabijavad I don't have a system that is affected by #1648 so I can't test that, but in theory this should handle both cases (duplicated coretemp hwmon directory entries and individual hwmon directory entries).

I chose to just to implement this as a simple string replacement / comparison since it's quicker and easier than doing a full stat() call on every temperature file to find duplicates.

On my Linux 5.7 system /sys/class/hwmon/hwmon2 is a symlink to /sys/devices/platform/coretemp.0/hwmon/hwmon2 meaning if you replace the leading /sys/devices/platform/coretemp.*/hwmon/ with /sys/class/hwmon/, you can quickly and easily check for duplicates.

[amanusk]

Can confirm the issue and fix. Following a recent kernel version, s-tui began displaying some temperature information twice.
Example for sensors_temperatures() without fix:

{
  "acpitz": [
    shwtemp((label = ""), (current = 48.0), (high = 128.0), (critical = 128.0))
  ],
  "pch_skylake": [
    shwtemp((label = ""), (current = 43.0), (high = None), (critical = None))
  ],
  "coretemp": [
    shwtemp(
      (label = "Package id 0"),
      (current = 51.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Core 0"),
      (current = 50.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Core 1"),
      (current = 47.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Package id 0"),
      (current = 51.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Core 0"),
      (current = 50.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Core 1"),
      (current = 47.0),
      (high = 100.0),
      (critical = 100.0)
    )
  ]
}

Package id0, core0, core2 are reported twice, with the same values
With fix:

{
  "acpitz": [
    shwtemp((label = ""), (current = 45.0), (high = 128.0), (critical = 128.0))
  ],
  "pch_skylake": [
    shwtemp((label = ""), (current = 39.0), (high = None), (critical = None))
  ],
  "iwlwifi_1": [
    shwtemp((label = ""), (current = 51.0), (high = None), (critical = None))
  ],
  "coretemp": [
    shwtemp(
      (label = "Package id 0"),
      (current = 45.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Core 0"),
      (current = 44.0),
      (high = 100.0),
      (critical = 100.0)
    ),
    shwtemp(
      (label = "Core 1"),
      (current = 45.0),
      (high = 100.0),
      (critical = 100.0)
    )
  ]
}

Sensors report for reference:

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +51.0°C

pch_skylake-virtual-0
Adapter: Virtual device
temp1:        +38.5°C


coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +45.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +45.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +44.0°C  (high = +100.0°C, crit = +100.0°C)

[modelrockettier]

Thanks @giampaolo !