getQuantityTable() no longer works correctly

[akbertram]

The getQuantityTable() function used paste() function to assemble the URL of the result of the export for download. This led to a download URL with a double forward slash, e.g. //resources/jobs/xyz/123/test.txt.

Previously, the ActivityInfo server accepted this, but with the migration to the new architecture, this (correctly) results in a 404.