startActivityForResult with earlier new Intent

We already make sure to use a copy of the Intent, but now we do so
earlier. See bug.

Bug: 353680402
Flag: EXEMPT bugfix
Test: manual
Test: atest com.android.settings.users.UserSettingsTest
            com.android.settings.users.UserDetailsSettingsTest
(cherry picked from commit b7240e2f0c50455a1c8f3ae1fc4f27d55b86e89b)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f86a8b75b191c7025599ea6911abf3aa36bb2056)
Merged-In: I860e9e606de6b8d3c99fa52a63b72ba7a99ce179
Change-Id: I860e9e606de6b8d3c99fa52a63b72ba7a99ce179