Incorrect localization token format variable

[Clstroud]

The head_tracking_unsupported_footer localization shows "null" for one of the format variables due to the last value being numbered incorrectly.

It is currently

This %1$@ on %2$@ %3$@ does not support head tracking.

Head tracking is supported on all devices with a %4$@ camera, and on most devices with %6$@.

and should be

This %1$@ on %2$@ %3$@ does not support head tracking.

Head tracking is supported on all devices with a %4$@ camera, and on most devices with %5$@.