[MC-199657] Arrow textures have a lot of unneeded extra space

I don't think any of this is necessary and as such it can be removed - the file should still work as 64x32 instead of 64x64.

Linked issues

[Mod] markderickson 2020-09-06T01:48:02Z

Hi there!

I can confirm for release 1.16.2.

[Mod] markderickson 2020-09-27T00:04:00Z

Confirmed for 1.16.3.

Avoma 2021-01-13T16:48:55Z

Can confirm in 20w51a.

Avoma 2021-01-29T10:33:42Z

Can confirm in 21w03a.

Avoma 2021-02-05T15:46:12Z

Can confirm in 21w05b.

Avoma 2021-04-03T18:32:01Z

Can confirm in 21w13a. I've attached an attachment to this ticket, of the new spectral arrow model.