Upgrade/Install: Actually move Hello Dolly plugin to directory structure.

This fixes an issue from [60666] where I neglected to `svn move` the files. 

Follow-up to [60666].

Reviewed by jeremyfelt.

Props swissspidy.

See #53323.




git-svn-id: https://develop.svn.wordpress.org/trunk@60670 602fd350-edb4-49c9-b593-d223f7449a82

Author: whyisjake