API changed, updating calls.

Bug: 116141567
Test: manual switcher test on mojave
Change-Id: I44d3667190a40a49cdc8cf4b76f4a4865e4e6dd1
(cherry picked from commit dd64556dc31f0cdac4fdde0afb0d9c33898871a2)
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java
index 618a4c1..53a7afe 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java
@@ -223,7 +223,7 @@
 
                 if (userRecord.mIsStartGuestSession) {
                     notifyUserSelected(userRecord);
-                    mCarUserManagerHelper.startNewGuestSession(mGuestName);
+                    mCarUserManagerHelper.startGuestSession(mGuestName);
                     return;
                 }