update the deprecated method of wdio v5 (#1519)

Author: kobenguyent

lib/helper/WebDriver.js

@@ -1244,7 +1244,7 @@ class WebDriver extends Helper {
       const elem = usingFirstElement(res);
       const elementId = getElementId(elem);
       if (this.browser.isMobile) return this.browser.touchScroll(elementId, offsetX, offsetY);
-      const location = await this.browser.getElementLocation(elementId);
+      const location = await elem.getLocation();
       assertElementExists(location, 'Failed to receive', 'location');
       /* eslint-disable prefer-arrow-callback */
       return this.browser.execute(function (x, y) { return window.scrollTo(x, y); }, location.x + offsetX, location.y + offsetY);