Fix M1919A6 and Maxim-Tokarev's unreasonable low sprint factor

[MR_87]

Weapon Name	Sprint Factor
Beltfed DP	50%
Maxim-Tokarev	35%
MG 42 100	50%
AN/M2 Stinger	45%
Browning M1919A6	35%
Type 100 MG	50%