Unable to select Multiple albums for Flickr photo block

[stephengsong]

Describe the bug You can select multiple album(s) for the Google Photo block but you can only select 1 album if Flickr is the source.

To Reproduce Steps to reproduce the behavior:

1. Add photo block
2. Select Flickr from "Source"
3. Try to select multiple "albums" from "Show photos from"

Expected behavior Should be same as Google Photos photo block where I can select multiple albums for the "Album(s)" dialog box

[Dan-Peck]

Merged in @ 3d2dabd and added to the queue for upcoming release to the live site.