Hand out proxy-go snowflakes more frequently than webextension snowflakes

We're now seeing several volunteers running both proxy-go instances and webextension Snowflake proxies (yay!). However, throughout the course of my dogfooding, it seems the quality of the connections has degraded and I get frequent disconnects. This requires more investigation, but I suspect the higher ratio of web extension proxies is part of the reason.

Right now we can tell the difference between the two because of the length of the ids. I propose prioritizing the handout of proxy-go instances in the short term until the root of this problem is more thoroughly investigated.