Design screen says that adding solar panels to a ship decreases its range

**Describe the bug**
When adding solar panels to a ship design, the design screen reports its range as decreased instead of increased, at least until the range becomes infinite.

**Steps to reproduce**
1. Design a ship
2. Add a solar panel

**Expected behavior**
The ship's range stat increases

**Actual behavior**
The ship's range stat decreases

**Screenshots**

**Related issues**
N/A

**Testing plan**
Tests for range calculations

**Additional context**
N/A