Revert "Small improvement"

This reverts commit a443f1299f.

app/src/main/java/eu/faircode/email/EntityOperation.java

@@ -453,7 +453,9 @@ public class EntityOperation {
             try {
                 JSONArray jargs = new JSONArray(args);
                 long tmpid = jargs.optLong(2, -1);
-                if (tmpid > 0)
+                if (tmpid < 0)
+                    return;
+
                 db.message().deleteMessage(tmpid);
             } catch (JSONException ex) {
                 Log.e(ex);