Reduce movement spread penalty for machine guns with 20-round magazines;

[向美利坚国_开战]

I believe all 20-round magazine machine guns at BR 3 should have low movement spread penalties on par with the TKB-336, yet the BR 4 Johnson LMG suffers the same hefty movement spread penalty as the BR 3 BAR, and it faces far tougher opponents to boot.（higher BR values correspond to lower movement spread penalties.）

• Yes（These low-capacity magazine machine guns spanning BR 3 to BR 4 genuinely deserve a buff）
• No （Their faster aim-down-sight speed and superior mobility already offset the drawbacks from movement spread penalties.）
• Buff the underperforming Johnson LMG.