Fix flaky view test

[matthewmueller]

Getting pretty frequent CI failures:

• https://github.com/livebud/bud/runs/7164495134?check_suite_focus=true
• https://github.com/livebud/bud/actions/runs/2602840303

I think it's related to bud server still needing a constant port, but the test suite picking a random port.

If this does turn out to be the problem, I'll still be surprised tests don't consistently fail.