Remove CAPABILITY_MULTI_USER from Bluetooth phoneAccount

Test:  local test. adb shell setprop ril.ecclist 911,122,*911,#911,411.
And then manual test that the bluetooth phone account is chosen for
411 ecall and verify after phone is disconnected, call contacts
are cleared

Bug: 138684166

Change-Id: I2bb74d7eda4cca35e87aa790a6f863c4a19e068b