Relevant issue

Closes #545

Summary of change

This fixes the issue of best budget and family size listings not showing on the explore page.

Make sure you checkout the same branch on the backend called "Explore listings" before doing these tests because both the front and backend needed changes to fix this bug.
Take a look at the listings on the Family and Budget containers and analyze if they meet the specified requirements which: Family Size should only show listings that have a capacity of 5 or more people, and Budget Size should only show listings that are $100 and above.
You can even create another listing to test it yourself, but the only issue is that when creating a new listing you'll notice that the "maxpeople" property under "details" in Mongo is set as a string instead of a int. (I couldn't figure out how to solve that as of now, so I'll open a ticket on it later).