Kibana version: 7.7.0
Elasticsearch version: 7.7.0
Server OS version: Archlinux
Browser version: FF 76.0.1
Browser OS version: Archlinux
Original install method (e.g. download page, yum, from source, etc.): Download page/AUR package
Describe the bug: CSV export filename has regressed to always being table.csv.

Steps to reproduce:

1. Open a visualization
2. Click one of the export links (Raw or Formatted)
3. File is named table.csv.

Expected behavior:
Visualization name is used for filename.

Any additional context:
#3625