Revert "Don't send the same values to onUpdateSelection repeatedly"

This reverts commit c743cb94.

Reason for revert:
This workaround is no longer necessary [1][2].

 [1]: I56f3198e54f689adc9541f2c2644ee19bcc6deed
      e345e90a
 [2]: Ic84fb070e0ff21dffb7e6c9bbdc6320eb5946fd9
      1046a22aae6d6c0ee21aca7446540a9d27902559

Fix: 183474466
Test: atest CtsInputMethodTestCases:InProcessImeTest
Test: atest CtsAccessibilityServiceTestCases:AccessibilityImeTest#testOnUpdateSelectionForInProcessA11yIme
Change-Id: Ie5d00bbc51b66f1d6b50969f03d1b3e3bca5e9da