Fix RestartDialog Regression

In a previous implementation the restart Dialog wasn't displayed
when a LAUNCHER_TASKBAR_EDUCATION_SHOWING was displayed at the
same time.

This assumption is now wrong so the dependency has been removed.

Flag: EXEMPT Small fix
Fix: 428925093
Test: atest WMShellUnitTests:CompatUIControllerTest
Test: atest WMShellUnitTests:RestartDialogWindowManagerTest
Test: atest WMShellUnitTests:RestartDialogLayoutTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d887d93a564fae298bfd8262a98749464a6b1fb5)
Merged-In: I765597b8aa34e1432308b416ab88f49d2ec6b90e
Change-Id: I765597b8aa34e1432308b416ab88f49d2ec6b90e