Use f-strings and simplify the code a bit.
When I call 'acpi-update.py' after those changes, the resulting .hwdb files are
the same except for two additions that appeared in the meantime. I don't think
it makes sense to update them again, because the ma-*.txt files changed and we
don't want to store big blobs unnecessarilly.
Adjust the parsing as it's no longer HTML files. Some IDs end with
whitespace, without being quoted, which seems like a mistake as they
weren't before, so strip the ID columns before applying them.
