"Download map" & "Download plot" buttons not working in `TESTING` version of app

[ignatiusm]

MFE report that the download buttons work well in the non-TESTING version of the app (old version) link in Edge and chrome on windows

BUT the download buttons do not work for the new TESTING version.

Oh, I am able to recreate this in firefox on linux - that buttons instead download some html files see below:

[yvanrichard]

Took me a while to understand, but should be fixed now.
The download button class needs "shiny-download-link"