Fix preview not loading after pressing guess button

[stardust66]

Context

• Fixes #366
• Make preview load when guessing location as well. Also fix clicking guess button disabling preview button.

Summary of Changes

• Move code that unhides the map to the updateMap function, so that it gets called when the guess button is clicked too.
• Add rebind function. See explanation in commit message. This fixes not being able to click the guess button twice, and that clicking the guess button disables the preview button.

Checklist

• [x] Tested Mobile Responsiveness
• [ ] Added Unit Tests
• [ ] CI Passes
• [ ] Deploys to Heroku on test Correctly (Maintainers will handle)
• [ ] Added Documentation (Service and Code when required)

[DeeDeeG]

I found out that the Preview button fails when the "Restroom Name" field (on the new restroom form) isn't empty. (This happens because we get a bad response from the Maps API).

In the test file, preview_steps.rb, the restroom name is filled out (with the text "Vancouver restroom" for the name).

So, given that the name field isn't empty, and due to the Maps API not liking the request we send out, at the moment the Geolocation fails and the test subsequently fails.

I looked into it a bit further, and the Restroom Name value gets passed to Google as part of the request we send out. I assume if that is not sent, we'll get a good response.

[DeeDeeG]

Seems like changing this line should fix it: new.coffee, line 44 or so

address = "#{name}, #{street}, #{city}, #{state}, #{country}"

[mi-wood]

Merging to a separate branch so I can fix the other issue