~/.config/waybar: Fix temperature path for new laptop

I _think_ this is the CPU, but don't know really.  The `name` file says
"thinkpad" so no idea.  There's another cooler temperature that is
called `amdgpu` but that seems more specific.  So it's this one for now.

.config/waybar/config

    },
    "temperature": {
        // "thermal-zone": 2,
        // "hwmon-path": "/sys/class/hwmon/hwmon2/temp1_input",
        "hwmon-path": "/sys/class/hwmon/hwmon3/temp1_input",
        "critical-threshold": 80,
        // "format-critical": "{temperatureC}°C {icon}",
        "format": "{temperatureC}°C",