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Fix ``sff_extract`` tool, drop type annotation
I don't think this tool is really used much, but it is loaded in `tool_conf.xml`. https://github.com/galaxyproject/galaxy/pull/11877 added type annotations, and that's a syntax error on 2.7 The alternative would be to fix the rest of the tool for 3.x, but I think we're just wasting our time there and we shouldn't touch this again.