bug#49043: 27.1: ibuffer-toggle-filter-group [BUGFIX]

[Boruch Baum]

I've been having operation ibuffer-toggle-filter-group reliably crash
whenever performed due to it trying to operate on a point beyond
point-max. The culprit seems to be in function ibuffer-map-lines where:

  (delete-region (line-beginning-position)
                 (line-end-position))))

is being performed instead of:

  (delete-region (line-beginning-position)
            (min (point-max) (1+ (line-end-position))))

This solves the issue for me.

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