Tabular Data: Update download button to match design documentation

[LevinMedia]

Update the download button to match the documentation per p6riRB-3lZ-p2

Currently:

Design documentation:

[joshuatf]

It looks like the "cloud-download" icon is not currently available in dash-icons and they're considering retiring it - WordPress/gutenberg#10552 (comment)

What do you think @LevinMedia ? Should we push to add the cloud-download icon or switch to an alternative?

Here's the current download option for reference - https://cloudup.com/cH8SR8Ki8v2

[LevinMedia]

Heya @joshuatf can we pull in gridicons here? http://automattic.github.io/gridicons/ The download cloud is available there too, but if that doesn't work, the icon you provided would work too.

[joshuatf]

Heya @joshuatf can we pull in gridicons here? http://automattic.github.io/gridicons/ The download cloud is available there too, but if that doesn't work, the icon you provided would work too.

@LevinMedia The full set doesn't seem to be available in Gutenberg where we pull icons and I don't think we'll want to add another dependency. But I'm sure we can add that single SVG path manually and include it inline.

[timmyc]

Closed by #560