fixed bug: _boundingBox in FlickrImageFinder was passing bounding box components in right order

flick expects minimum_longitude, minimum_latitude, maximum_longitude, maximum_latitude. (from
bbox docs at https://www.flickr.com/services/api/flickr.photos.search.html). However,
ngeohash.decode_bbox(geohash) returns them as [minlat, minlon, maxlat, maxlon]. This meant the
search sent to flickr was valid most of the time, but wasn't the actual bounding box I wanted.

This may also explain why searches on the side of the screen in world view(extra left and right)
often didn't work, because they could have become mapped to invalid bounding boxes.