Previously OHM did not support for multile user switch
Now we hook SysUI onUserSwitch callback to update
latest one handed mode functionality by currentUserId
Test: atest SystemUITests
Test: atest WMShellUnitTests
Test: manually switch user and observe verify different OHM config
for different users
Bug: 182278800
Change-Id: I8ae7d0aedcafc8f477f41d2703df2df53839a89f