Fix TreeItem shows cell edit in the wrong column when select_mode=Row
and TreeItem has multiple columns
#89977
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Fix #88892
Editor would not be brought up when clicking on all but the last column on a TreeItem with SelectMode=Row with multiple columns and all editable, and when the editor was being brought up when clicking on the last column, it was editing the first column.
The reason for that was that the draw_item function was setting the set_meta parameter for that TreeItem for each loop, ignoring if it already had that parameter set, and the select_single_item function was only considering the first column when dealing with a TreeItem with SelectMode=Row.
Fixed draw_item, gui_input, and edit_selected functions by setting set_meta parameter for each column.
Fixed select_single_item function by changing selected_col depending on input.