call_notifications: fix editable state of call notifications

Text message notificaitons sent regarding the status of a call
(i.e. busy, call lasted xx:yy mins, etc) were editable due to being
a TextEdit and not a Text

Change-Id: I9ded20a9b4dbdbaee034b0de6ae42e1eca2c02a0

src/app/commoncomponents/CallMessageDelegate.qml

@@ -113,7 +113,7 @@ SBSMessageBase {
 
             }
 
-            TextEdit {
+            Text {
                 id: callLabel
                 objectName: "callLabel"