Fix: Remove trailing slash from DISTANCE_REQUEST_CREATE route

[eL1fe]

Summary

Fixes #77760

The DISTANCE_REQUEST_CREATE.getRoute() function was generating a URL with a trailing slash when backToReport parameter is undefined/empty. This caused the route to not match the expected pattern, resulting in a NotFound page when navigating to the "Track distance" screen.

Before:

create/track-expense/start/123/456/distance-new/

After:

create/track-expense/start/123/456/distance-new

Root Cause

In src/ROUTES.ts, the getRoute function used template literals that always included the trailing segment:

return `${action}/${iouType}/start/${transactionID}/${reportID}/distance-new/${backToReport}` as const;

When backToReport is undefined, this produced a trailing slash.

Fix

Added a conditional check to only append backToReport when it has a value:

if (backToReport) {
    return `${action}/${iouType}/start/${transactionID}/${reportID}/distance-new/${backToReport}` as const;
}
return `${action}/${iouType}/start/${transactionID}/${reportID}/distance-new` as const;

Test Plan

1. Open a chat
2. Click "+" → "Track distance"
3. Verify the screen loads correctly without NotFound error
4. Verify the URL does not have a trailing slash

Tests

• Verify that no errors appear in the JS console
• I verified there are no console errors (after closing the498 issue, those are separate)

QA Steps

• I linked the correct issue in the Fixes line above

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