LargestPeakProperties does not return position

[JelleAalbers]

Since LargestPeakProperties is missing 'peaks.reconstructed_positions*' in its extra_branches list, its code for finding peak positions (https://github.com/XENON1T/hax/blob/master/hax/treemakers/common.py#L244) never succeeds. Consequently the branches s2_x etc. created by this treemaker are always nan.

Incidentally, this minitree has some branches that clash with Basics (e.g. s2_area_fraction_top), but they do not have the same meaning (in Basics the s2 refers to the main S2, in LargestPeakProperties the largest S2).

[feigaodm]

Thanks for noticing this bug. Will fix it before releasing new hax. Fixed in PR(#102)?