Fixed syntax error on line 253 in prep.py

[StandingPadAnimations]

Exactly what the title says, I can't push to dev for some reason

[zNightlord]

You might need to add that to the load material one too since I missed it.

MCprep/MCprep_addon/materials/prep.py

Line 622 in ef78447

pack_format=self.packFormat,

[StandingPadAnimations]

Alright, I'll merge this, but I've also noticed some other issues with incorrect types, such as like 637 (where a literal is used instead of MCprep_addon.sequences.ExportLocation).

@zNightlord, just curious, does your Python setup catch avoidable type errors like this? If not, I would highly suggest looking into revamping it. While I can try my best to catch these errors during the review process, things will definitely pass through as seen here. I know I sound harsh, but it's easier to catch and fix errors during development rather then fixing them during the last stretch before release (especially now that we can't commit directly to dev anymore)

[TheDuckCow]

Approving.

As per the other thread, I think it's important to not directly push to dev - slightly annoying to always have to use a PR, but mistakes easily happen with "quick fixes" right before releases, I've been there before. Thanks for making the change here, and we'll surely fix other things as we go along.