Issue:
fix(api_locking): fix the unit interpretation for `LockSettings` expiry

## Type of Change
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- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description

Currently, due to variable shadowing we are accidentally multiplying the timeout by 1000 resulting in a very high expiry for the API lock. 

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### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
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## Motivation and Context

Issue faced during the debugging, payments being locked for a long time

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## How did you test it?
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## Checklist
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- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Resolution:
<think>
PR Context:
- Title: fix(api_locking): fix the seconds and millis mismatch while fetching configuration
- Merged: 2023-12-13T06:13:44Z
- Files changed: 1 files
- Commits: 1 commits

Implementation approach:

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description

Clones #3121 

<!-- Describe your changes in detail -->


### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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Provide links to the files 
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(api_locking): fix the seconds and millis mismatch while fetching configuration (#3122)
Files to modify:


**crates/router/src/configs/settings.rs**
  Modify existing code