Cosmetic fix for DropBox (R4x86)

Some of you may have already noticed that the display for the “Current testing” version in Dropbox has been broken since some days. The reason was that Dropbox changed the format of their RSS feed which confused the add-on a bit. To fix this and of course to allow you to upgrade to a test release of Dropbox again, I fixed the checks within the add-on and so there’s now an updated version available:

As always, the update should be available from the “My Account” page for all current users.