Mobilizon.Events.sanitize_bounding_box_params

Called by:

• Mobilizon.Events.events_for_bounding_box (L1543)
• Mobilizon.Events.events_for_bounding_box (L1544)
• Mobilizon.Events.events_for_bounding_box (L1545)
• Mobilizon.Events.events_for_bounding_box (L1546)