Move a 'type: ignore' comment, for mypy

[ferdnyc]

Trying to run nox -s lint on the project, I discovered that mypy doesn't like one particular return call because the type: ignore comment is on the wrong line.

Output before change

src/furo/__init__.py:311: error: Returning Any from function declared to return "Style"  [no-any-return]
src/furo/__init__.py:312: error: Unused "type: ignore" comment  [unused-ignore]

[pradyunsg]

Thanks @ferdnyc!