cd8286ef05
We recently started to passing available postgres storage sizes to the
frontend with location details at 7b430520. However, we didn't apply
this to available VM storage sizes, resulting in them lacking location
keys. But they use same JS function, so it broke vm creation page. If
the options are a single-dimension array and not a hash, there's no need
for selecting by location. But if it's not an array, we should select by
location.