Drop type check on BirdFlow Routes

[ethanplunkett]

From Hermione:

Hi Ethan. I am currently working with the genoscape data for connectivity validation. Is it possible to change the function to let user define other datatype?

Error in validate_Routes_route_type(route_df$route_type) : 
  Invalid 'route_type' values found: genoscape. 'route_type' must be one of: tracking, banding, motus, unknown, synthetic

Options are to drop the check on type or to at "genoscape" as a valid type. The first is a general fix that allows users to define route types and seems to be the better of the two.