Update Bootstrap.cfc

onSessionEnd was throwing "component [coldbox.system.web.Controller] has no  function with name [getContext]" on line 409 of Bootstrap.cfc
You can see where this changed wasn't properly migrated here: https://github.com/sigmaprojects/coldbox-platform/commit/f0d0c06978c13d6898f25beb7867e4b4ba9d565f#diff-72f7f16b3388b51a9c08275aaab3e078L436
This should fix it.