Complete missing props

[krysal]

Fixes

Fixes #786 by @zackkrida
Fixes #815 by @krysal

Description

This PR:

• sets a default value for is-search-route property in the VLogoButton instead of requiring it every time and
• sets the size of the VSearchBar in the error layout (404 page), fixing its style.

Testing Instructions

Follow steps in the linked issue, the warning errors should be gone.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My code follows the established code style of the repository.
• [-] I added or updated tests for the changes I made (if applicable).
• [-] I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[zackkrida]

LGTM!

[obulat]

Thank you for fixing these, @krysal ! Fewer warnings is always better.