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builder: Show warning for invalid action on GtkShortcut

Matthijs Velsink requested to merge velsinki/gtk:builder-gtkshortcutaction-warning into main

The parsing for a GTK_TYPE_SHORTCUT_ACTION on a GtkShortcut in a builder file can fail, resulting in a NULL GtkShortcutAction. This currently does not result in any warnings, potentially making typos in builder files tricky to debug.

Since gtk_shortcut_action_parse_builder() already sets an error if it fails, we can just use that and simply return false.

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