Change: Decrease USA Alpha Aurora bomb drop speed to match the regular Aurora bomb drop speed

[Stubbjax]

This change slightly reduces the Aurora Alpha's bomb speed to match the vanilla Aurora. From maximum range, this increases the time to impact by roughly three frames. Based on several comments in #655, it seems reasonable to slightly nerf the Aurora Alpha in a subtle way that maintains the same feeling of 1.04 in terms of damage output, but with a higher skill requirement to use and greater potential for counterplay from attentive opponents. And what better way to do it than streamlining some counterintuitive differences?

Before:

Bombs strangely travel at different speeds, which feels somewhat counterintuitive. It is evident that even though the bombs are dropped on the same frame, the Alpha Aurora's bomb travels slightly faster to the ground and impacts four frames earlier.

AUR_DIFF.mp4

After:

Both bombs now have identical speed and impact the ground at roughly the same time (only one frame apart due to the slightly different travel distances). Note that the detonation from the vanilla Aurora bomb coincidentally destroys the Aurora Alpha bomb and stops it from detonating, which is a phenomenon that occurs with most if not all projectile weapons in 1.04.

AUR_SAME.mp4

[xezon]

According to video, Alpha Bomb hits 5 frames sooner than the other Bomb.

[xezon]

With this change I observe Alpha Aurora bomb drop time of 37 frames vs original 26 frames. Plus fuel bomb triggers 2 frames later than before. So all together new Alpha Aurora bomb is 13 frames slower - almost half a second.

[xezon]

New measured sample frames

Original

Alpha Aurora Bomb hit 30
Alpha Aurora Fuel trigger 26
Alpha Aurora Fuel explode 58
Aurora Bomb hit 34

Patched

Alpha Aurora Bomb hit 35
Alpha Aurora Fuel trigger 35
Alpha Aurora Fuel explode 66
Aurora Bomb hit 36

Observations

1. There appears to be some variance in Aurora Bomb flight duration. I have measured 33 to 37 frames. Not sure where this rather large discrepancy comes from.

2. The Alpha Aurora bomb stops for around 2 frames before impact. Something is not right there.

[xezon]

Impact issue appears to come from GeometryMajorRadius = 12.0 vs GeometryMajorRadius = 2.0

[xezon]

Looks proper.