Whether a term is characteristic of a certain dialect or region isn’t generally considered all that much when it comes to order on Wiktionary, unless it’s an “obscure” dialect. I contribute a lot to Wiktionary (mainly for languages other than Modern English though) and there are few rules on the specific the order of definitions, it’s mostly just common definitions above uncommon definitions (but this isn’t even a hard rule).

Editing it to change the order for your reason specifically might be considered vandalism, as it’s typical and allowed for entries to be like this and it’s common for little disputes like that to cause editing wars (although that’s admittedly far more common on Wikipedia, since many Wiktionary contributors are actually linguists and are less controversial).

That being said, someone actually did intentionally move the “gang member” definition above the other one, so there’s clearly some sort of difference in opinion.

If you want it changed, the course of action you should take is starting a discussion about it. It’s a good way to get a community consensus.