Minor Garand buff, infantry do not hold pos by default.

While I typically avoid making such small changes (5% RoF boost,
5% range boost), in the case of rifle range/RoF, small changes
add up rather quickly given the large numbers involved. Hopefully
this brings Garands up to snuff without breaking inf too badly.

Also, the range differences between garands and other rifles were
radically more pronounced with hold-pos by default. Going to try
excluding inf from the hold pos widget and see if it goes over ok
with people.