[agent] fix issue where breakpoints went to the wrong line
[agent] fix issue where breakpoints went to the wrong line

The sourceURL flag was being set lower down in the agent.js dist file
This mismatch was causing the sources pane to mis-align the lines where
the breakpoints were being set.

onelovelyname/marionette.inspector,marionettejs/marionette.inspector,onelovelyname/marionette.inspector,marionettejs/marionette.inspector,onelovelyname/marionette.inspector,marionettejs/marionette.inspector