Use startActivityAsUser instead of startActivity
in LegacySimpleDialogHandle.

Bug: 282210693
Test: atest WifiDialogManagerTest
Test: Manual Test
       1. Start as the main user.
       2. adb shell cmd wifi launch-dialog-simple -s \
              -m testMessage \
	      -l https://www.google.com/ 0 4
       3. Click the link. Ensure that Chrome opens.
       4. Switch to a secondary user.
       5. Repeat steps 2 and 3.
Change-Id: If7151273d273ab6779454f6d92a7b28f3fdeed7c
1 file changed