Do not check single reg permission for destroying SipDelegate

When destroying the SipDelegate, the app may have lost single reg
permission due to it not being the default SMS app anymore. Do not
throw a SecurityException in this case, since the app would already
need a valid token (in the form of a ISipDelegate instance) in order
to call this API.

Bug: 192371276
Test: atest CtsTelephonyTestCases:SipDelegateManagerTest
Change-Id: I5681ab9ba1c4e85f4a127937250485cd4c482890
1 file changed