Incorrect black hole ability description

**Describe the bug**
Black holes say that the "sector" of the system inflicts damage, but it should be the "center" of the system.

**Steps to reproduce**
1. View a black hole system.

**Expected behavior**
The ability description says that the center of the system inflicts damage.

**Actual behavior**
The ability description says that the sector of the system inflicts damage.

**Screenshots**

**Related issues**
N/A

**Testing plan**
???

**Additional context**
N/A