Offsets generate route errors

get_bundle_waypoints tries to reverse the offset between ports (line 243, 244):

if start_angle in [90, 270]: offsets_start = [-_d for _d in offsets_start]

When routing from a set of 270-degree ports to a set of 0-degree ports to their SW, the router throws a route error. Below is a minimum example of this behavour:

` import gdsfactory as gf

c = gf.Component("pads_bundle_steps")
pt = c << gf.components.pad_array(
    gf.partial(gf.components.pad, size=(30, 30)),
    orientation=270,
    columns=3,
    spacing=(50, 0),
)
pb = c << gf.components.pad_array(orientation=0, columns=1, rows=3)
pt.move((500, 500))

routes = get_bundle_from_steps_electrical(
    pt.ports,
    pb.ports,
    end_straight_length=60,
    separation=30,
    steps=[{"dy": -50}, {"dx": -100}],
)

for route in routes:
    c.add(route.references)

c.show()`

This can be fixed by removing the 270 from the list: if start_angle in [90]: offsets_start = [-_d for _d in offsets_start]

[joamatab]

it works for all the tests cases we have, im releasing 5.7.0 with all your new improvements, thank you Thomas!

[joamatab]

just released 5.7.0