Dump IMMS#mCurrentUserId instead of IMMS#mSettings

This is a follow up to my previous commit [1], which replaced

  InputMethodManagerService#mSettings

with

  InputMethodManagerService#mCurrentUserId

for better separation of concern.

What I overlooked was that

  InputMethodManagerService#dumpAsStringNoCheck

remained to dump the current user ID as IMMS#mSettings.

With this commit it is logged as a dump of mCurrentUserId.

 [1]: Idae0fb6d1a9182efe917f81a1d881d488a1b57e5
      745f9e77

Bug: 305849394
Bug: 329163064
Test: adb shell dumpsys input_method | grep mCurrentUserId
Change-Id: I4b7dc1b0e52e9bf25095eb2e3cc520d46b3869e5