JS: Add @problem.severity to an example query

Author: asgerf

javascript/ql/examples/queries/dataflow/EvalTaint/EvalTaint.ql

@@ -2,6 +2,7 @@
  * @name Taint-tracking to 'eval' calls
  * @description Tracks user-controlled values into 'eval' calls (special case of js/code-injection).
  * @kind problem
+ * @problem.severity error
  * @tags security
  * @id js/examples/eval-taint
  */