ipfilter-updater.json: Fix extract_dir

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Fixes Could not find 'IPFilter'! (error 16) for v3.0.3-beta.

Installing 'ipfilter-updater' (3.0.3-beta) [64bit] from extras bucket
Loading IPFilter.msi from cache
Checking hash of IPFilter.msi ... ok.
Extracting IPFilter.msi ... Exception: D:\Scoop\apps\scoop\current\lib\core.ps1:638
Line |
 638 |          throw "Could not find '$(fname $from)'! (error $($proc.ExitCo …
     |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Could not find 'IPFilter'! (error 16)

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