Location obfuscation for sites sometimes does not work for whole numbers

[atruskie]

Location obfuscation does not work (for sites) when the latitude or longitude are entered as whole numbers.

Steps to reproduce:

1. change a site's location to -23,127
2. load the site's json in a browser (e.g. https://staging.ecosounds.org/projects/645/sites/754.json)

Acutal:
custom_latitude":-23.0,"custom_longitude":127

results vary

Expected: random jitter added to both numbers.

As results vary, it seems like that maybe jitter is being added before rounding occurs. In cases where the location numbers are whole numbers, the very small jitter effect is sometimes even rounded away completely.