Fix Drag Lifecycle events not fired for data transfers

[fridolin-koch]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Bug fix

• What is the current behavior? (You can also link to an open issue here)

https://github.com/akserg/ng2-dnd/issues/175

• What is the new behavior (if this is a feature change)?

"Lifecycle" events are now correctly emitted when a file is dragged over a dnd-droppable-Enabled element.

• Other information:

[MNorgren]

@fridolin-koch - Any idea why the CI Build failed? This PR would be an excellent addition...

[fridolin-koch]

@MNorgren I guess it was unrelated to my pr, I rebased on master and now it works