fix whitespace issue with search and title in model and mcp catalog

[Philip-Carneiro]

Description

Add a small fix for the gap between title and search bar when only one cat is available

• Before PF mode
  Model Catalog

MCP Catalog

• Before non-PF mode
  Model Catalog

MCP Catalog

• After PF mode
  Model Catalog

MCP Catalog

-After non-PF mode
Model Catalog

MCP Catalog

How Has This Been Tested?

It was manually tested, the changes are visual.

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages
• Automated tests are provided as part of the PR for major new functionalities; testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• Code changes follow the kubeflow contribution guidelines.
• [] For first time contributors: Please reach out to the Reviewers to ensure all tests are being run, ensuring the label ok-to-test has been added to the PR.

If you have UI changes

• The developer has added tests or explained why testing cannot be added.
• Included any necessary screenshots or gifs if it was a UI change.
• Verify that UI/UX changes conform the UX guidelines for Kubeflow.

[google-oss-prow]

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