fix: Aikar's `InitiatingHeapOccupancyPercent` value for large servers

[Norbiros]

Prerequisites

• [x] A similar pull request does not already exist, or this pull request supersedes an existing pull request.
• [x] The project's contributing and relevant documentation have been acknowledged and adhered to.
• [x] I have signed off all of my relevant commits.

Information

According to original Aikar's post:

If you have and use more than 12GB of memory, adjust the following:

• -XX:InitiatingHeapOccupancyPercent=20

This fixes Aikar's flag generation for large (12+ GB of RAM) servers.