style: remove blank line

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

treefmt.nix

@@ -18,7 +18,6 @@
         ];
         excludes = [ ".envrc" ];
       };
-
       rustfmt.excludes = [ "src/options/flags.rs" ];
       taplo.excludes = [ "tests/ptests/*.toml" ];
       yamlfmt.excludes = [ "./powertest.yaml" ];