[Minor] Fix two issues of enhanced straight trajectory

[CrimRecya]

• Fix when Trajectory=Straight bullet with Trajectory.Straight.ProximityMedial=true is attacking a large building, the warhead may snap to the center of the building. Trajectory.Straight.ProximityMedial=yes sometimes detonating warheads at structure #1499
• Fix when Trajectory=Straight bullet with a large Trajectory.Straight.ProximityRadius and a low Trajectory.Speed, the final speed may suddenly increase and rush out of range.

[github-actions]

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[mevitar]

Trajectory.Straight.ProximityMedial=yes now fires properly at the projectile instead of the building.

And as i tested it i noticed that previous builds might have had issues with reading Bright= from the Trajectory.Straight.ProximityWarhead=, because right now i'm getting bright flashes of light each time the proximity fuse is triggered, and i don't remember them being there earlier.

Whether i simply didn't notice it or there was an actual bug that got fixed... it works fine now (in fact, other warhead effects, like AttachEffect, appear to work too).

[CrimRecya]

Trajectory.Straight.ProximityMedial=yes now fires properly at the projectile instead of the building.

And as i tested it i noticed that previous builds might have had issues with reading Bright= from the Trajectory.Straight.ProximityWarhead=, because right now i'm getting bright flashes of light each time the proximity fuse is triggered, and i don't remember them being there earlier.

Whether i simply didn't notice it or there was an actual bug that got fixed... it works fine now (in fact, other warhead effects, like AttachEffect, appear to work too).

I didn't make any changes to the flash. Maybe it was not noticed at that time? Anyway, I will merge this repair. Thank you for your test.