cmd/hakurei: exec instead of fork/exec from shell

There is no reason to keep the shell process around.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/hakurei/command.go

@@ -191,7 +191,7 @@ func buildCommand(ctx context.Context, msg message.Msg, early *earlyHardeningErr
 			if flagPulse {
 				config.Container.Filesystem = append(config.Container.Filesystem, hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSDaemon{
 					Target: fhs.AbsRunUser.Append(strconv.Itoa(container.OverflowUid(msg)), "pulse/native"),
-					Exec:   shell, Args: []string{"-lc", "pipewire-pulse"},
+					Exec:   shell, Args: []string{"-lc", "exec pipewire-pulse"},
 				}})
 			}