Fixes filter from being undefined in shifting filters

[rithviknishad]

WHAT

🤖 Generated by Copilot at d9b4eac

Fix phone number filter for shifting requests. Use nullish coalescing operator to avoid sending invalid values to the API in ListFilter.tsx.

Proposed Changes

• Fixes Shifting filters malfunctioning #5815

@coronasafe/care-fe-code-reviewers @coronasafe/code-reviewers

Merge Checklist

• Add specs that demonstrate bug / test a new feature.
• Update product documentation.
• Ensure that UI text is kept in I18n files.
• Prep screenshot or demo video for changelog entry, and attach it to issue.
• Request for Peer Reviews
• Completion of QA

HOW

🤖 Generated by Copilot at d9b4eac

• Prevent sending invalid phone number to API filter by adding nullish coalescing operator (link)

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[nihal467]

LGTM

[github-actions]

@rithviknishad We truly appreciate your efforts. Thank you for taking the time to contribute; this is a very valuable contribution to us 🥇. We always welcome your contribution 🙂, so feel free to contribute to anything anytime, and never lose that spirit of innovation 🙌.