Minor refactoring to DisplayInfo.class

[yaRnMcDonuts]

Follow up on a review from this previously merged PR #2031 :

"I would suggest privatizing the variables and adding getter/setter methods. Don't use 'record' otherwise you break the engine's compatibility with java 8 and all applications currently out there.

If you think the values of the variables should be immutable, then I would suggest writing the class like this:

public class DisplayInfo {
    
    private long displayID = 0;
    private int width = 1080;
    private int height = 1920;
    private int rate = 60;
    private boolean primary = false;
    private String name = "Generic Monitor";
    
    public DisplayInfo() {}

    public DisplayInfo(long displayID, int width, int height, int rate, boolean primary, String name) {
        this.displayID = displayID;
        this.width = width;
        this.height = height;
        this.rate = rate;
        this.primary = primary;
        this.name = name;
    }

    public long getDisplayID() {
        return displayID;
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public int getRate() {
        return rate;
    }

    public boolean isPrimary() {
        return primary;
    }

    public String getName() {
        return name;
    }
    
}

"

Originally posted by @capdevon in #2031 (comment)