Fixed image downsize issue when lazyload disabled

[girishpanchal30]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Added a condition to skip image downsizing for REST API requests.

if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
	return $image;
}

Closes #704

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[pirate-bot]

Plugin build for a506af1 is ready 🛎️!

• Download build
• Download dev