Fix calibration resolution default bug

[samfreund]

Description

During the move to Vue 3 (see #1900), the default calibration for resolution wasn't properly set. This fixes the issue.

closes #2145

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with settings back to v2025.3.2
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added

[Gold856]

I get 1920x1080 defaulted on page reload despite the fact that it's not an option. Otherwise, it's blank. This is with a camera with no video modes.

[Gold856]

What's the default resolution supposed to be?

[samfreund]

What's the default resolution supposed to be?

Whatever the camera's current resolution is

[Gold856]

Placeholder Camera has nothing selected by default now, which feels odd.