light.1: Fix save/restore brightness option flip

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

light.1

@@ -46,9 +46,9 @@ Get brightness, default
 Set minimum brightness to value
 .It Fl P
 Get minimum brightness
-.It Fl I
-Save current brightness
 .It Fl O
+Save current brightness
+.It Fl I
 Restore previously saved brightness
 .El
 .Sh OPTIONS