Don't delete old call messages on new call message

app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java

@@ -448,9 +448,7 @@ public class SmsDatabase extends MessagingDatabase {
 
     CallMessageType callMessageType = message.getCallType();
     if (callMessageType != null) {
-      long callMessageTypeMask = getCallMessageTypeMask(callMessageType);
-      type |= callMessageTypeMask;
-      deleteInfoMessages(threadId, callMessageTypeMask);
+      type |= getCallMessageTypeMask(callMessageType);
     }
 
     ContentValues values = new ContentValues(6);
@@ -683,12 +681,6 @@ public class SmsDatabase extends MessagingDatabase {
     return getMessage(messageId);
   }
 
-  public void deleteInfoMessages(long threadId, long type) {
-    String where = THREAD_ID + " = ? AND (" + TYPE + " & " + type + ") <> 0";
-    int updated = getWritableDatabase().delete(TABLE_NAME, where, new String[] {threadId+""});
-    notifyConversationListeners(threadId);
-  }
-
   private boolean isDuplicate(IncomingTextMessage message, long threadId) {
     SQLiteDatabase database = databaseHelper.getReadableDatabase();
     Cursor         cursor   = database.query(TABLE_NAME, null, DATE_SENT + " = ? AND " + ADDRESS + " = ? AND " + THREAD_ID + " = ?",