Removed element.scope() calls by using the scope which we compile with

Makes ngDialog work with AngularJS 1.3 when $compileProvider debug info is disabled ($compileProvider.debugInfoEnabled(false)).
@voronianski I wanted to be explicit because to me the code looks clearer then, but maybe it's unnecessary, just a habit I have. Didn't know about void 0 nor that undefined can be overwritten, so once again, thanks for the feedback :)