Bug in listings search - price filter

[Mossie93]

If someone creates a listing with the price of 2M and selects "1M+" option in the max price input of the search section, the mentioned listing won't show up.

Reproduction steps:

1. Go to the landing site and check what is the maximum value of the max price input (in the search section)
2. Using an administration panel, create a listing with the price higher than the one in step 1.
3. Go to the landing site, select maximum value in max price input (search section) and submit your search
4. Listing from step 1 won't show up in the results.

Possible solution proposed in #14