sambaundoguididx: renamed to downgradedatabase

In forthcoming commits we're going to repurpose this script to do an
entire downgrade of a database, disabling all new database features.
downgradedatabase is a more appropriate name.

Signed-off-by: Aaron Haslett <aaronhaslett@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>

diff --git a/source4/scripting/bin/sambaundoguididx b/source4/scripting/bin/sambadowngradedatabase
similarity index 100%
rename from source4/scripting/bin/sambaundoguididx
rename to source4/scripting/bin/sambadowngradedatabase