bridge: Give a default size to a new pty
bridge: Give a default size to a new pty

Otherwise applications will get 0x0, and not all handle that well.
The fish shell, for example, will refuse to print its prompt and
commandline.

Fixes #4523
Closes #4537
Reviewed-by: Lars Uebernickel <3318dc5ce3e4fb7c28a0b841b6801c884e1d0896@uebernic.de>

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