Update SMS/MMS as sending when retrying failed send.

This was only impacting SMS/MMS as Push already reset the status.

app/src/main/java/org/thoughtcrime/securesms/jobs/MmsSendJob.java

@@ -113,6 +113,11 @@ public final class MmsSendJob extends SendJob {
     return KEY;
   }
 
+  @Override
+  public void onAdded() {
+    DatabaseFactory.getMmsDatabase(context).markAsSending(messageId);
+  }
+
   @Override
   public void onSend() throws MmsException, NoSuchMessageException, IOException {
     MmsDatabase          database = DatabaseFactory.getMmsDatabase(context);

app/src/main/java/org/thoughtcrime/securesms/jobs/SmsSendJob.java

@@ -65,6 +65,11 @@ public class SmsSendJob extends SendJob {
     return KEY;
   }
 
+  @Override
+  public void onAdded() {
+    DatabaseFactory.getSmsDatabase(context).markAsSending(messageId);
+  }
+
   @Override
   public void onSend() throws NoSuchMessageException, TooManyRetriesException {
     if (runAttempt >= MAX_ATTEMPTS) {