Remove reference to unused reload_paths option (#2322)
Remove reference to unused reload_paths option (#2322)

The option was removed in bedf235ff68998c0fd87f7531c860f82381312c2.
However, it wasn't deleted from the params hash, so a nil value is
always being passed in.
middleman/middleman,middleman/middleman,middleman/middleman,middleman/middleman