Clean up directory ownership

... as recommended by the Fedora packaging guidelines [1].

The parent directories for shell completions are now owned by the
filesystem RPM [2,3].  So, there won't be any unowned directories, if
the toolbox RPM doesn't own them without depending on some other package
that owns those directories.

There's no need to do a build just for this.

[1] https://docs.fedoraproject.org/es/packaging-guidelines/UnownedDirectories/

[2] CentOS Stream filesystem commit f486d3fa6a5559ff1
    https://gitlab.com/redhat/centos-stream/rpms/filesystem/-/commit/f486d3fa6a5559ff1
    https://issues.redhat.com/browse/RHEL-1338

[3] Fedora filesystem commit 4c45982cd067557e
    https://src.fedoraproject.org/rpms/filesystem/c/4c45982cd067557e
    https://bugzilla.redhat.com/show_bug.cgi?id=1504616

Resolves: RHEL-95209

toolbox.spec

@@ -192,9 +192,9 @@ install -m0644 %{SOURCE1} %{buildroot}%{_sysconfdir}/containers/%{name}.conf
 %doc CODE-OF-CONDUCT.md CONTRIBUTING.md GOALS.md NEWS README.md SECURITY.md
 %license COPYING %{?rhel:src/vendor/modules.txt}
 %{_bindir}/%{name}
-%{_datadir}/bash-completion
-%{_datadir}/fish
-%{_datadir}/zsh
+%{_datadir}/bash-completion/completions/%{name}.bash
+%{_datadir}/fish/vendor_completions.d/%{name}.fish
+%{_datadir}/zsh/site-functions/_%{name}
 %{_mandir}/man1/%{name}.1*
 %{_mandir}/man1/%{name}-*.1*
 %{_mandir}/man5/%{name}.conf.5*