disable handleTouch doesn't work

[amhofny]

Describe the bug
Disabling handleTouch is not working, if you set to false, the default value true will always be used, and the same goes for injectBaseStyles.

To Reproduce
Just set handleTouch to false and check the result, a more appropriate way is to edit the test case "accepts custom settings", like below to include "handleTouch" and "injectBaseStyles", and then run tests:

 it("accepts custom settings", () => {
      const anchor = document.querySelector(".test-anchor");
      const drift = new Drift(anchor, { inlineOffsetX: 12, handleTouch: false,
                                        injectBaseStyles: false });

      const expectedConfig = defaultDriftConfig();
      expectedConfig.inlineOffsetX = 12;
      expectedConfig.handleTouch = false;
      expectedConfig.injectBaseStyles = false;

      expect(drift.settings).toEqual(expectedConfig);
    });

Expected behaviour
handleTouch and injectBaseStyles to remain false after initialization with custom options, and touch is disabled on mobile.

Information:

• drift version: i am using master branch