Kernel: Unbreak profiling all processes

Regressed in 8a4cc73.
We stopped generating "process created" when enabling profiling,
which led to Profiler getting confused about the missing events.

Kernel/Syscalls/profiling.cpp

@@ -32,11 +32,11 @@ KResultOr<int> Process::sys$profiling_enable(pid_t pid)
  ScopedSpinLock lock(g_processes_lock);
  if (!TimeManagement::the().enable_profile_timer())
  return ENOTSUP;
+ g_profiling_all_threads = true;
  Process::for_each([](auto& process) {
  PerformanceManager::add_process_created_event(process);
  return IterationDecision::Continue;
  });
- g_profiling_all_threads = true;
  return 0;
  }