Ensure that OnCannedTextResponsesChanged callback is fired

Bug: 22952515

Change-Id: Ic94db1dd2fc9d7db2259265b90be86617ed93971
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index 49f738b..d91fa90 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -1019,6 +1019,7 @@
                 && !parcelableCall.getCannedSmsResponses().isEmpty()) {
             mCannedTextResponses =
                     Collections.unmodifiableList(parcelableCall.getCannedSmsResponses());
+            cannedTextResponsesChanged = true;
         }
 
         boolean videoCallChanged = parcelableCall.isVideoCallProviderChanged() &&