netdata: fix absolute path to lm_sensors binary

It results in failure to collect metrics:
```
 > libexec/netdata/plugins.d/go.d.plugin -d -m sensors
...
ERR sensors/sensors.go:73 sensors exec initialization: stat /usr/bin/sensors: no such file or directory collector=sensors job=sensors
ERR module/job.go:231 init failed collector=sensors job=sensors
CONFIG go.d:collector:sensors:sensors delete
```

Signed-off-by: Jakub Sokołowski <jakub@status.im>

pkgs/tools/system/netdata/default.nix

@@ -234,6 +234,7 @@ stdenv'.mkDerivation (finalAttrs: {
     wrapProgram $out/bin/netdata-claim.sh --prefix PATH : ${lib.makeBinPath [ openssl ]}
     wrapProgram $out/libexec/netdata/plugins.d/cgroup-network-helper.sh --prefix PATH : ${lib.makeBinPath [ bash ]}
     wrapProgram $out/bin/netdatacli --set NETDATA_PIPENAME /run/netdata/ipc
+    substituteInPlace $out/lib/netdata/conf.d/go.d/sensors.conf --replace-fail '/usr/bin/sensors' '${lm_sensors}/bin/sensors'
 
     # Time to cleanup the output directory.
     unlink $out/sbin