Reduce RICH CK theta resolution plot limits for Run III

Based on a number of recent discussions

https://mattermost.web.cern.ch/lhcb/pl/kp9mimj3jtr3mnehhwyndgf11o

Panoptes!136 (comment 6230604)

reduce the CK theta resolution plot ranges to reflect the better resolution, and thus tighter pre-selection limits, in Run III.

Should go with Moore!1924 (merged)