Add a Equalized Fill role queue option with roughly equal chance to get each role.

Hello, I like to do fill because I don't wanna main 1 role only and I wanna randomly play a bit of everything. However, fill dumps you into jg and support 90% of the time, so it still doesn't feel really random/refreshing. It would be cool to have a equalized fill with roughly equal chance of getting each role for when you can't decide a role and wanna cycle through various.