fix: typo in ActionHelpers (appium#937)

touc -> touch

Author: kkb912002

appium/webdriver/extensions/action_helpers.py

@@ -96,7 +96,7 @@ def tap(self, positions: List[Tuple[int, int]], duration: Optional[int] = None)
  """
  if len(positions) == 1:
  actions = ActionChains(self)
- actions.w3c_actions = ActionBuilder(self, mouse=PointerInput(interaction.POINTER_TOUCH, 'touc'))
+ actions.w3c_actions = ActionBuilder(self, mouse=PointerInput(interaction.POINTER_TOUCH, 'touch'))
  x = positions[0][0]
  y = positions[0][1]
  actions.w3c_actions.pointer_action.move_to_location(x, y)