Fix fdfind bash completion symlink in Debian packages

[lawrence3699]

Fixes #1888.

Before this change, scripts/create-deb.sh installed the bash completion file as usr/share/bash-completion/completions/fd but created the fdfind symlink as ./fd.bash, which leaves a dangling symlink in the Debian package.

This updates the bash completion symlink to ./fd, matching the installed file name. The fish and zsh fdfind symlinks already point to their installed completion file names, so this makes the bash packaging consistent with the sibling paths.

Validation:

• bash -n scripts/create-deb.sh
• git diff --check
• local packaging-layout fixture confirming fdfind -> ./fd resolves alongside the existing fish and zsh completion symlinks

[Copilot]

Pull request overview

Fixes a Debian packaging issue where the fdfind bash-completion symlink was created with a dangling target, preventing completions from working for the fdfind alias.

Changes:

• Update scripts/create-deb.sh to symlink fdfind bash completion to ./fd (matching the installed completion filename).
• Add a corresponding entry to the Unreleased bugfixes section in CHANGELOG.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/create-deb.sh	Fixes the fdfind bash-completion symlink target to match the installed fd completion file name.
CHANGELOG.md	Documents the Debian fdfind bash-completion symlink fix under Unreleased bugfixes.

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[tmccombs]

This was fixed by #1889