perf: use true private variables in code example

[GeorgianStan]

The TS access modifier private is removed in detriment of true private
variables.
Use the same code for PointAnimationComponent class to fix wrong
variable names that were used when the document was translated for
other languages.

[GeorgianStan]

Hi @mgechev. Did you have time to review the PR?

[chevette17]

#include <Joystick.h>

// Create the Joystick
Joystick_ Joystick;

// Constant that maps the physical pin to the joystick button.
const int pinToButtonMap = 9;

void setup() {
// Initialize Button Pins
pinMode(pinToButtonMap, INPUT_PULLUP);

//Initialise USB !IMPORTANT!
USB_Begin();

// Initialize Joystick Library
Joystick.begin();

}

// Last state of the button
int lastButtonState = 0;

void loop() {

// Read pin values
int currentButtonState = !digitalRead(pinToButtonMap);
if (currentButtonState != lastButtonState)
{
Joystick.setButton(0, currentButtonState);
lastButtonState = currentButtonState;
}

delay(50);

}