Fix backward compatibility when there's no secureElementName

secureElementName can be unspecified in xml file.
If secureElementName is not specified, offHostName is null.
Then ApduServiceInfo#isOnHost returns true even if it is off-host
because mOnHost is wrongly set to true.

Test: manual
Bug: 137916987
Change-Id: I52ad1f09d3733fc435a937397fc9a433bd630a46