LP#1739638 AngularJS CSV Download Progress Bar Won't Close

LP#1739638 AngularJS CSV Download Progress Bar Won't Close

Delays text preparation for printing or CSV generation until
after the progress dialog opens, preventing the dialog from
remaining open if the data resolves before it opens and
triggers the close action prematurely.

To test:
- open a populated AngularJS grid
- refresh the page (behavior is more likely after refresh)
- click Download Full CSV or Print Full Grid on the toolbar
- note the progress dialog doesn't close
- apply patch, repeat steps, and note the dialog closes

Signed-off-by: Dan Briem <dbriem@wlsmail.org>
Signed-off-by: Steven Mayo <smayo@georgialibraries.org>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>