Routes window - address box does not resize vertically

[Adrian Wilkins]

Editing routes, the address box is just large enough to display about 1.5 addresses

The natural impulse is to resize the form vertically.

While the box will grow horizontally, it doesn't grow vertically.

[Mathieu Trudel-Lapierre (cyphermox)]

Triaged/Wishlist: I'm not sure why it wasn't done that way from the beginning, but it sounds like an omission.

Also marking as bitesize since it's a bug fix that should be easily approachable to someone new to Ubuntu, and willing to contribute, to fix; provided a little guidance.