Use proper calibration multipliers and not magic multipliers

[tomayac]

joy-con-webhid/src/parse.js

Lines 309 to 315 in 29435e0

	// ToDo: This should use proper calibration data and not a magic number
	// (1995).
	horizontal = ((horizontal / 1995 - 1) * 2).toFixed(1);
	let vertical = ((rawData[7] >> 4) | (rawData[8] << 4)) * -1;
	// ToDo: This should use proper calibration data and not a magic number
	// (2220).
	vertical = ((vertical / 2220 + 1) * 2).toFixed(1);

joy-con-webhid/src/parse.js

Lines 328 to 334 in 29435e0

	// ToDo: This should use proper calibration data and not a magic number
	// (1995).
	horizontal = ((horizontal / 1995 - 1) * 2).toFixed(1);
	let vertical = ((rawData[10] >> 4) | (rawData[11] << 4)) * -1;
	// ToDo: This should use proper calibration data and not a magic number
	// (2220).
	vertical = ((vertical / 2220 + 1) * 2).toFixed(1);