contrib/bsddialog: Tag import 1.1

Add: slider dialog.
Imported to enable testing and to complete the geomman(8) utility.

Developed as part of the "Full Disk Administration Tool for FreeBSD"
project, Braulio Rivas (brauliorivas@), Google Summer of Code 2025.

Sponsored by:	Google LLC (GSoC 2025)
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