/usr/share/budgie-desktop/keycontrol/custom-keys.d/gnome-screenshot-clipboard.dconf is in budgie-desktop-environment 0.9.9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [custom-keybindings/budgie-screenshot-window-clipboard]
binding='<Ctrl>Print'
command='gnome-screenshot -w -c'
name='Copy a screenshot of a window to clipboard'
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