fix: set shouldEmitValueChange to true on user change event for select

[eneajaho]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/goetzrobin/spartan/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [x] Bugfix

Which package are you modifying?

• [x] select

What is the current behavior?

When we set the form value asynchronously the select won't respond to the first selection from the user (the form value won't be updated)

Closes #303

What is the new behavior?

Synchronously updating the form value doesn't break the initial selection from the user.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information