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columnview: fix listbase cast

gwillems requested to merge g.willems/gtk:fix_columnview_to_listbase_cast into main

ColumnView doesn't inherit from ListBase but from Widget, so the GTK_LIST_BASE (self) cast may crash.

Pass the correct parameter to ListBase API.

This fixes a regression introduced by !7240 (merged) , I observed a segfault when starting the GTK inspector from Ctrl+Shift+I, here a backtrace from gtk4-widget-factory: bt_widgetfactory_columnview.txt

Edited by gwillems

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