WP Rocket banner is also displayed when WP Rocket is installed but deactivated

[piotrbak]

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Describe the bug
When WP Rocket is installed but deactivated, we are displaying banner in the Bulk Optimization section. The banner is giving 20% of discount for WP Rocket purchases, not sure if people who already have WP Rocket need it.

To Reproduce
Steps to reproduce the behavior:

1. Install WP Rocket
2. Go to Media > Bulk Optimization
3. See banner

Expected behavior
I think we should display banner only if WP Rocket is not installed

Backlog Grooming (for WP Media dev team use only)

• Reproduce the problem
• Identify the root cause
• Scope a solution
• Estimate the effort

[GeekPress]

@Mai-Saad FYI, this is ready for review.