Troubleshoot/refactor listener issues

[notmessenger]

This change was introduced in order to resolve failing tests @joshforisha was encountering at /tests:

https://github.com/softlayer/sl-ember-components/blob/71ae7ee739b7f9b2d20780c6b166da781ef3857b/addon/components/sl-date-range-picker.js#L104

This is not a change that should have had to have been implemented though so any of the following things may be the cause:

• either jQuery isn't cleaning something up correctly
• this component isn't cleaning something up correctly
• the sl-date-picker component it is relying on isn't cleaning something up correctly

This issue's work will dovetails with https://github.com/softlayer/sl-ember-components/issues/426

[alxyuu]

Just removed that line since it was not needed. Tests still pass.

[notmessenger]

https://github.com/softlayer/sl-ember-components/pull/435 intersects this same file/line

[SpikedKira]

#1458 will likely close this issue as there is no longer a reliance on jquery event binding.