Use SystemUI Dialog Theme for QSSecurityFooter dialog

Without the ContextThemeWrapper, the dialog's text color
gets changed whenever the QS theme changes.

Bug: 62534577
Test: manual, CTS Verifier > Managed Provisioning > Device Owner Tests
      > Network Logging UI

Change-Id: I408902688b97bb3c6dff06215b12956ae49a4806
(cherry picked from commit da9bee26)