Use transverse width for X-bar containment

[jdkio]

The X bar used the wrong transverse width. This caused the hough transform to get very confused. It would add a bunch of extra hits to the candidate. Then it was up to DB scan to fix the issue by making sure what it found was contiguous.

Note that this is only a problem for pileup or busy events. A single muon event should process about the same. But this would lead to different behavior in X and Y views.

See these diagnostic plots using branch jdkio/266_hough_attempt_diagnostics. In them, we see all hits would be hough seeds (orange circles), rather than only the ones along the line. This would also lead to bad line candidates, which is why the red line is not pointing along the eventual DB scan's hits. The DB scan hits then fix the issue slightly. Those hits are then removed for the next attempt, but I'm not sure that helps much. The Y view wasn't affected, which is how we were able to find the issue.

Before

After

[toi42]

Actually, this pull seems to somehow drop efficiency. While this is being investigated, we should hold off on merging this in.

(EDIT: this is also on a single neutrino file, so something has gone wrong deeper than this fix)

On this pull

Main with the same settings