Ellipsize text only if needed

 Only add ellipsis in TextUtils.makeSafeForPresentation when getSystemFontMap is empty
  if the text needs trimming. Fixes NotificationAccessConfirmationActivityTest#start_showsDialog.

Test: atest com.android.settings.notification.NotificationAccessConfirmationActivityTest#start_showsDialog
Test: atest MakeSafeForPresentationTest
Bug: 300157932
Change-Id: I8e9d2305bbb34755b57d37771fba4984e29ff520