Fix ceiling hippie drop

Fixes bug https://github.com/hawkthorne/hawkthorne-journey/issues/1085
I created a property for the proximity to the hippie before it drops and test if the player is within that in either direction.
Refactored for legibility

removed the new triggerProx property, made it clearer (thanks CalebJohn).
Merge pull request #1243 from lafncow/patch-2

Fix ceiling hippie drop