Highest acc and highest HS acc awards are broken

[x0rnn]

Weapon          Acrcy  Hits/Shts Kills Deaths Headshots
-------------------------------------------------------
KNIFE           0.0    0/3       0     0      0
LUGER           61.5   8/13      2     0      3
THOMPSON        0.0    0/0       0     6      0
BAZOOKA         0.0    0/0       0     1      0
GRENADE         0.0    0/4       0     4      0
MG42            24.3   92/378    10    0      0
CARBINE         0.0    0/0       0     1      0

The MG42 shots don't decrease the accuracy.

[Aranud]

The behaviour is wanted following https://github.com/etlegacy/etlegacy/issues/1302

Currently, someone using flamethrower will get the accuracy boosted but someone using mg will get it reduced. This makes the award at the end of the game meaningless.

Considering this, the accuracy and headshot computation are fine.