Don't override AccessibilityDelegate for any views.

This overridden AccessibilityDelegate simply removed the clickListener
for an associated view whenever a11y technology is enabled. It was
called for `mSeekBar` and `mEndTouchArea` views.
- For `mSeekBar` it was a no-op since a SeekBar doesn't have a click
listener anyway, however it lead to bug when using Switch Access
described in b/374869964.
- For `mEndTouchArea` it actually broke the click action because it
removed the clickListener that was set before. That led to inability to
add or remove group devices with Talkback.

Flag: EXEMPT bugfix
Bug: 374869964
Test: locally on a physical device.
Change-Id: I36468dd15757103fe034ce1fe833b1c6f5f49f57