specs: Rename same-scope.table.toml

This should have a hyphen.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/specs/samescope.table.toml b/specs/same-scope.table.toml
similarity index 100%
rename from specs/samescope.table.toml
rename to specs/same-scope.table.toml