CLIENT: Fix crosshair alignment

[JCR64]

Description of Changes

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Adjusts the standard and grenade crosshair to match the PSP refactor here: nzp-team/vril-engine#100

Compared to before:

• the crosshair spread is noticeably tighter by a few pixels
• the crosshair origin has shifted 1 pixel down and 1 pixel to the right
• grenade pulse doesn't look right

I'd guess originally an extra padding of 5 pixels (or one crosshair arm length) was being added, but because it wasn't documented and it isn’t present on PSP I haven't included it but a similar padding could be added back in if preferred.

For the 1 pixel shift, both crosshair positions are valid. This matches PSP exactly, but it can be shifted back if preferred.

The grenade pulse is mostly fixed by changing the cur_spread and crosshair_offset2 values back to what it is on PSP but some extra padding may be required as well.

Visual Sample

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Screenshots at 640x480 resolution on Windows:

Before	After
Top/Left Gap: 26px, Bottom/Right Gap: 25px	Top/Left Gap: 22px, Bottom/Right Gap: 22px

Lines up with CrossHairWeapon stat here:

quakec/source/shared/weapon_stats.qc

Line 4020 in b98233b

crosshair_spread = 22;

Checklist

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• I have thoroughly tested my changes to the best of my ability
• I confirm I have not contributed anything that would impact Nazi Zombies: Portable's licensing and usage
• This Pull Request fixes a critical issue that should be reviewed and merged as soon as possible

[MotoLegacy]

Workflow run approved.

[JCR64]

Changed the calculations to remove any possible rounding errors. I originally tested at 640x480 but after testing some other resolutions I found it wasn't as consistent as I had hoped, but now with this change it's correct no matter what resolution is picked. It is now pretty much 1:1 with the PSP refactor.

Also addressing 2 points I made in the description:

• the crosshair origin has shifted 1 pixel down and 1 pixel to the right

Restored this 1 pixel shift. I compared some screenshots of mainline COD games (including WaW) and this is where they have their center point (on PC at least).

• grenade pulse doesn't look right

Changed it to the PSP values so it matches the PSP behaviour.

[MotoLegacy]

Thanks for the updates. Does this updated logic also more accurately reflect the fired weapon's spread?