Make `shell ime reset` work again for bg users

This is a follow up CL to my previous CL [1], which unexpectedly
changed the behavior of

  adb shell ime reset

in a certain situation, that is, when you call it with '--user' option
such as '--user all' and '--user 10', and if there is any manually
enabled IME for background users, then such manually enabled IMEs are
no longer disabled.

With this CL, such a manually enabled IME (if any) will be reset into
the disabled state as it used to be.

 [1]: I01d13d1f46a5af19d6db18246f74a20a4fe14168
      13e67d43fad05ba8c94d47751efe46297175855d

Test: Manually verified as follows
  1. Build aosp_bluejay-trunk_staging-userdebug and flash it
  2. make -j SoftKeyboard
  3. adb shell pm create-user test_user
  4. adb shell am start-user 10
  5. adb install --user 10 -r  \
         $OUT/system/app/SoftKeyboard/SoftKeyboard.apk
  6. adb shell ime list -s --user 10
     -> SoftKeyboard not is included.
  7. adb shell ime enable --user 10  \
         com.example.android.softkeyboard/.SoftKeyboard
  8. adb shell ime list -s --user 10
     -> SoftKeyboard is included.
  9. adb shell ime reset --user 10
 10. adb shell ime list -s --user 10
     -> SoftKeyboard not is included.
Bug: 309837937
Fix: 336899188
Change-Id: I406031c59575a51b70382dc8a6af55e36d875953

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