go: add a precision tag to go/examples/deferinloop

Author: erik-krogh

go/ql/src/experimental/InconsistentCode/DeferInLoop.ql

@@ -4,6 +4,8 @@
  *              This can lead to unintentionally holding resources open like file handles or database transactions.
  * @id go/examples/deferinloop
  * @kind problem
+ * @problem.severity warning
+ * @precision high
  * @tags defer
  *       nesting
  */