Update deprecated methods

Author: isaacakakpo1

app/src/main/java/com/telnyx/webrtc/sdk/ui/MainViewModel.kt

@@ -103,14 +103,14 @@ class MainViewModel @Inject constructor(
         destinationNumber: String,
         clientState: String
     ) {
-        telnyxClient?.call?.newInvite(
+        telnyxClient?.newInvite(
             callerName, callerNumber, destinationNumber,
             clientState, mapOf(Pair("X-test", "123456"))
         )
     }
 
     fun acceptCall(callId: UUID, destinationNumber: String) {
-        telnyxClient?.call?.acceptCall(
+        telnyxClient?.acceptCall(
             callId,
             destinationNumber,
             mapOf(Pair("X-testAndroid", "123456"))