Bugfix: drop token after use

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

src/main/java/de/srsoftware/widerhall/data/User.java

@@ -137,6 +137,11 @@ public class User {
         Database.open().query(sql).compile().run();
     }
 
+
+    public void dropPasswordToken() throws SQLException {
+        Database.open().update(TABLE_NAME).set(RESET_TOKEN,null).where(EMAIL,email).compile().run();
+    }
+
     /**
      * Withdraw a specific permission from the user object.
      * Updated permission flag will be written to db.