Change call to single-gesture tap

Author: imurchie

appium/webdriver/webdriver.py

@@ -201,7 +201,7 @@ def tap(self, positions, duration=None):
                 duration = duration
                 action.long_press(x=x, y=y, duration=duration).release()
             else:
-                action.press(x=x, y=y).release()
+                action.tap(x=x, y=y).release()
             action.perform()
         else:
             ma = MultiAction(self)