Cannot select a tree when filtering on a field with a space in the field name

[jwalgran]

On the website

1. Create a custom planting site field named "Test Field". Make it editable and filterable on mobile.
2. Add a planting site and set the value of "Test Field"

On the iOS app

1. Find the newly created planting site and verify that you can tap it and see its detail popup. Tap away from the planting site to clear the selection.
2. Filter the map by "Test Field" so that it will match the value used when creating the planting site.
3. Tap the planting site, which should still be visible because it matches the filter.

Expected: The detail popup appears
Actual: The detail popup does not appear

[jwalgran]

After some investigation I discovered that the API request to get the plot nearest to the tapped location were returning an "Invalid signature" 400 error. The signatures do not match because the iOS application is passing active filters to the locations/lat,lng/plots endpoint and there is a discrepancy between the way the space character with the filter JSON is encoded on the server vs. on the client.

The locations/lat,lng/plots actually disregards the q= parameter, so we can sidestep the issue entirely by not passing the filters.