IMS: Fix exception while answering psuedo DSDA VoWIFI call

While disconnecting existing connections for answering
DSDA VoWifi call, ignore non TelephonyConnections.
This avoids class cast exception when ConferenceParticipant
connections are tried to be casted to TelephonyConnection.

CRs-Fixed: 2814274
Issue: FP3-A13#56
Change-Id: I09c7f18195ad768e20d5b928e13486a3751a22a4
(cherry picked from commit a07dc99792b5a82e1d1144c3e270ef28e49a5084)
1 file changed