fix: reduce loading time for plugin connection

[abaicus]

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:

• Lowers the waiting time for connection to 5 seconds instead of 25.

Closes Codeinwp/optimole-service#1349.

How to test the changes in this Pull Request:

1. Either connect with an existing api key or creating a new account;
2. The loading should take a lot less than previously, while the onboarding images should be sent to the service for optimization;

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]

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