Revert "Disable child runs first to fix idle"

This reverts commit e741439983.

ktweak

@@ -63,6 +63,9 @@ write /proc/sys/kernel/perf_cpu_time_max_percent 5
 # Do not group task groups automatically
 write /proc/sys/kernel/sched_autogroup_enabled 0
 
+# Execute child process before parent after fork
+write /proc/sys/kernel/sched_child_runs_first 1
+
 # Preliminary requirement for the following values
 write /proc/sys/kernel/sched_tunable_scaling 0