fix: fixed strict check for paymasterUrl in useCapabilities

[hexcow]

Title:

Fixed strict check for paymasterUrl in useCapabilities

Description:

What changed? Why?
Previously, paymasterService was added even when paymasterUrl was an empty string (""), resulting in an invalid configuration. Now, the check ensures that paymasterService is only included if paymasterUrl is not empty, preventing incorrect payloads.

Notes to reviewers
The main change is in the conditional logic—switched from a loose check to an explicit validation. This prevents edge cases where an empty string could lead to an incomplete configuration.

How has it been tested?

• Added cases with empty and non-empty paymasterUrl values.
• Verified that paymasterService is only included when the URL is present.
• Checked integration with usePaymaster to ensure no regressions.

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