Rename flag

Renaming flag to send deleteIntent on user-initiated dismiss in order to
restart the workflow

Flag: com.android.systemui.media_controls_user_initiated_deleteintent
Bug: 342366185
Bug: 335875159
Test: atest NotificationMediaManagerTest
Change-Id: Ib742012138fe1a71b3480d78e9ebe9f12b05fc4c