[PassKey] #2051 Enhancement: use underlying trait implementation from tx payment pallet

[saraswatpuneet]

Go after: #2047

Goal

The goal of this PR is to reduce redundancy in pre_dispatch and validate by calling tx payment pallet underlying implementation

Closes #2051

Discussion

Checklist

• [ ] Chain spec updated
• [ ] Custom RPC OR Runtime API added/changed? Updated js/api-augment.
• [ ] Design doc(s) updated
• [ ] Tests added
• [ ] Benchmarks added
• [ ] Weights updated

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files	Coverage Δ
pallets/passkey/src/lib.rs	94.57% <100.00%> (-0.36%)	:arrow_down: