Clear transient of marketplace data when deactivating plugin

[circlecube]

When testing multiple plugins, that is deactivating one brand plugin and activating another, the product data for the first brand will be cached in a transient and loaded in a different brand plugin.

This is a minor issue, but would be nice to have if users are to ever be prompted to update from mojo to bluehost for example, the marketplace data should refresh based on the brand change.