In accounting flow, change the Clinics select to be a multiselect

[colinxfleming]

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• What are we trying to do?
  Clinics sometimes belong to the same network and operate multiple locations, but tend to return pledges from every location. It would help some funds out a bit if this were a multi-select rather than a dropdown.

• What feature or behavior is this required for?
  Easier accounting reconciliation

• How could we solve this issue? (Not knowing is okay!)
  I'm not totally up to speed on what good multi-select options there are but I would bet bootstrap has at least one! No need to do anything too fancy.

This will also probably require a change to the accountants controller endpoint to let this take multiple clinics.

• Anything else?
  the url here is /accountants

[morgancollado]

I can take this on.

[elasticspoon]

I can take this one!

[colinxfleming]

thank you @elasticspoon !