stop wrapping our custom js loading in a require block
stop wrapping our custom js loading in a require block

fixes: CNVS-31034

test plan:
* with a cdn for asset hosting
* upload a custom account js file that uses jquery
  (do something with the $ variable like `console.log($.ui.version)`)
* in webpack and requireJS:
* load a page in that account
* the custom js should load and have access to
  jquery.

This fixes the issue that was introduced in
78268a8821e81e309058549d48320fc091759788 and reverted in
5d34165b2ed9a8ec030fbd393cab08d298a22765.

Change-Id: I2d36b5fd0d5f1af450d2ccd71a5a14c953e61724
Reviewed-on: https://gerrit.instructure.com/89059
Tested-by: Jenkins
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
QA-Review: Benjamin Christian Nelson <4a283f6b032925e40a485c88ede5597d7d65a090@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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