a11y: Autoclick change pause button text on click

When the pause button is clicked and its icon is changed to a resume
button, its corresponding text needs to update with it.

Screenshot: b/411187719#comment2

Bug: b/411187719
Test: AutoclickTypePanelTest
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: If2a9763076cfca5d3c2249c643d8181a8f2e841d