fixed undefined reference to BIF.dispatch

Hello,

I'm building monocle from the master branch, and it started throwing errors about undefined reference to BIF.dispatch. Looking around the code, I haven't found any other reference to BIF namespace, so it appears to me that it should be just a normal dispatchEvent() call, which is what this pull request is fixing.

Please let me know if I'm missing something, and BIF namespace should rather be known to monocle.