cli: prioritize --help and fix its output#4213
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Fixes #4212
Since this isn't the first time that the output of
--helpdidn't get checked after modifying the argparse help texts, I've added some tests.I've also moved the
if args.helpstatement to the top ofmain()and prioritized--helpby doing that, like it is common with other CLI applications. Streamlink shouldn't suppress the help text if there's an input URL set.