Region captures can't capture the whole screen

[s1hofmann]

Version
2.1.0

Short overview
Due to an off by one error it's impossible to capture the whole screen when specifying a region.

Steps to reproduce error

describe("Capture", () => {
  it("fullScreen capture", () => {
    // GIVEN
    const screenSize = libnut.getScreenSize()

    // WHEN
    const capture = () => libnut.screen.capture(0, 0, screenSize.width, screenSize.height);

    // THEN
    expect(capture).not.toThrowError("Error: Given width exceeds display dimensions");
  });
});