Apply new flow to hint user about triple-tap will delay when user select...

Apply new flow to hint user about triple-tap will delay when user select triple-tap shortcut on window-mode.

Root Cause: Original content in magnification switch shortcut dialog needs to have different versions for different accessibility software shortcuts. Use the generic content and new flow to replace it.

Solution: Apply new flow from UX suggestion.

Bug: 210593079
Test: make RunSettingsRoboTests ROBOTEST_FILTER=MagnificationModePreferenceControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilityDialogUtilsTest
Change-Id: Id09b8847cca4fce1f3fb77770a03bff53ae05855