redbear-power: parse Ngid and TracerPid procfs fields instead of ignoring

Adds ngid and tracer_pid fields to ProcStatus struct. These were
previously silently discarded during /proc/<pid>/status parsing.

local/recipes/system/redbear-power/source/src/pid_detail.rs

@@ -19,6 +19,8 @@ pub struct ProcStatus {
     pub pid: Option<u64>,
     pub ppid: Option<u64>,
     pub pgrp: Option<u64>,
+    pub ngid: Option<u64>,
+    pub tracer_pid: Option<u64>,
     pub session: Option<u64>,
     pub uid_real: Option<u64>,
     pub uid_effective: Option<u64>,
@@ -192,8 +194,8 @@ fn read_status(pid: u32) -> ProcStatus {
             "Pid" => s.pid = num(value_str),
             "PPid" => s.ppid = num(value_str),
             "Tgid" => s.pgrp = num(value_str),
-            "Ngid" => {}
-            "TracerPid" => {}
+            "Ngid" => s.ngid = num(value_str),
+            "TracerPid" => s.tracer_pid = num(value_str),
             "Uid" => {
                 let mut parts = value.split_whitespace();
                 s.uid_real = parts.next().and_then(|x| x.parse().ok());