Fixed vindicator arm animation failing to load

[Jonathing]

The vindicator animation JSON had a stray "-" string literal where a number is supposed to be. Based on the patterns in the animation arrays, I replaced it with 5 as I assume that's what was originally supposed to be written and/or outputted by Blockbench.

Very impressive that this went unnoticed for so long. I had to trace back 6 stack frames in my debugger just to find that this was causing all the GeckoLib console spam.

[milkyskies]

I think the project has been abandoned :(