Fix: Update outdated Service Designer icon [4.4.0]

[wso2-engineering-bot]

This PR was automatically generated by Claude AI.

• Issue: Outdated Service Designer Icon #2093
• Type: Documentation
• Summary: Updated the Service Designer icon reference from service_designer_icon_bank_api.png to service_designer_icon_bank_api_3.png to use the newer, properly aligned icon that shows the complete integration context including the /deposit resource.

Changes:

• Updated image reference in first-integration-route-and-transform.md to use the updated icon image

Note: Pre-existing mkdocs build warning about missing kafka-connector file in nav configuration exists in the base branch and is unrelated to this change.

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[DedunuKarunarathne]

This PR does not fix the issue mentioned.