idrive: update livecheck, use versioned url

[khipp]

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Related to #171006.

[samford]

I pushed a commit to make some tweaks to the strategy block:

• The version and download_id variables are MatchData objects, so it helps to use a variable name that includes "match" to help make this clear (usually we just use a variable named "match" when there's only one match object but we have to distinguish between the two here).
• I assume that the second part of the version (070624) is numeric or alphanumeric but there's something to be said for using the loose ([^/]+?) instead, which will match any text between the forward slashes.

Outside of that, this looks good to me but someone else will have to approve it since I'm the last pusher.

[khipp]

@samford Thank you! The advice is much appreciated.