Update pureos/sloppy to 3.24.23; fix window resizing and file chooser
Supersedes !19 (closed).
GTK 3.24.20 and .23 have 2 regressions for us compared to 3.24.8:
- Window resizing was broken and later fixed, but the fix isn't in a release yet; bundle a patch
- File chooser gained an extra column; merge all columns into one and have the treeview look like a faux-listbox. All options to show/hide columns still work, but instead add/remove extra values to the second row.