Set the number of slots for IMS enable for each slot

Number of slots is set when ims binding.
However, when feature is updated in binding state, the changed number of slots is not set.

Bug: 331971397
Test: manual test
      DSDS off in hidden menu -> Fi SIM enable -> check statue of IMS
Change-Id: I628ee7f57e41f82fc3e5fed5a886a6ec20e7f6c6