Fix for basic mod data checker

[jkbcdev]

Fixes "unsupported archive for quick installer" error when trying to quick install an archive that has a single folder that gets moved by the data fixer. This is the same error and fix from this pull request, but for the basic mod data checker.

[ZashIn]

The question is whether this should be

1. "fixed" / worked around only in BasicModDataChecker
   ⇒ favor this PR over Fix Subnautica installer error #157 and remove the "fix" from all derived classes, like CyberpunkModDataChecker
2. changed in the InstallerQuick (Simple Installer) itself here, since by definition .dataLooksValid() should only return FIXABLE if .fix() already implements a fix for that filetree, so traversing / unfolding the tree is redundant / unnecessary at that point.

Furthermore the current InstallerQuick approach checks the file tree multiple times if no VALID file tree is found, executing dataLooksValid() each time on:

• root folder for VALID
• then every solo sub folder for VALID
• then once more the root for FIXABLE

That means this workaround redirects each of the above checks to .dataLooksValid(root).

So in my opinion, InstallerQuick should stop traversing the file tree as soon as VALID or FIXABLE is found and always rely on the required .fix() in the latter case. This also reduces the .dataLooksValid() calls by 1 to n(subfolders).