usbhidctl.1: adjust option list indent

For improved legibility.

usr.bin/usbhidctl/usbhidctl.1

@@ -79,7 +79,7 @@ flag is specified
 attempts to set the specified items to the given values.
 .Pp
 The options are as follows:
-.Bl -tag -width Ds
+.Bl -tag -width "-f device"
 .It Fl a
 Show all items and their current values if device returns.
 .It Fl f Ar device