Show a different message for viewing same product that's in the cart

[andrewlimaza]

• ENHANCEMENT: Show a different message when the item in the cart is for the level you are looking at.

This shows a different message when viewing a membership linked product that is already in your cart, to make things clearer. It doesn't compare levels linked to the product itself but as long as it's a level linked product we show a different message.

Resolves: https://github.com/strangerstudios/pmpro-woocommerce/issues/81

All Submissions:

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

[andrewlimaza]

Here's a sample of viewing a product on the store that is in your cart and linked to a membership level.

[andrewlimaza]

Updated it to simplify the message even further. It now shows "Product name is already in your cart"