startActivityForResult with new Intent

Rather than use the raw Intent, we make a copy of it. See bug.

Bug: 330722900
Flag: EXEMPT bugfix
Test: manual
Test: atest com.android.settings.users.UserSettingsTest
            com.android.settings.users.UserDetailsSettingsTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1189e24e47571eae86634aeaa7dc60b8fe7f4820)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:73210aa26773ae91f23361f51eb00399643726a8)
Merged-In: Id74e4b7ae261f2916eedaef04a679f83409a4b67
Change-Id: Id74e4b7ae261f2916eedaef04a679f83409a4b67