SDIS dumps the project CSV to screen on Safari

[ben3000]

Problem

Tapping the Download all Projects button on the Browse all Projects page dumps the CSV to screen on Safari.

Reproducible example

• Step 0: Open the Apple Safari browser on a Mac. (On an iPhone, I'm presented with the option to view or download the result)
• Step 1: Go to https://sdis.dbca.wa.gov.au
• Step 2: Tap on Browse all Projects
• Step 3: Tap the Download all Projects button
• Step 4: Notice that the CSV data is presented in the browser window, rather than as a downloaded file.

[florianm]

This sounds like we're missing a content disposition header. Will investigate.