Don't use boolean to store coral switch state

```java
public Boolean getHasCoral() {
    return hasCoral;
  }

  @Override
  public void periodic() {
    if (coralSwitch.get()) {
      hasCoral = true;
    } else {
      hasCoral = false;
    }
  }
```

`hasCoral` serves no real purpose here. It's just a proxy for reading the switch. `getHasCoral` (which could just be named `hasCoral`) should return the value of the switch directly