Do not set maxWidth on images embedded w/in the rce
Do not set maxWidth on images embedded w/in the rce

rolls back https://gerrit.instructure.com/c/canvas-lms/+/197254

closes COREFE-185

when a TD is not given a size, setting max-width causes it to shrink.
whatever issue this originally intended to address, we'll fix when
the image sizing work is completed.

test plan:
  - in the rce add a table with a couple columns
  - put text in one column, and an image in the other
  - in html edit mode, remove the style="width: 50%;" (or similar)
  - return to rich text mode
  > expect the image to be it's natural size, and not shrunken down
    to almost nothing.

Change-Id: Ib7df4c1d28f4827fe004b313aff51f6eb232aafc
Reviewed-on: https://gerrit.instructure.com/204569
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
QA-Review: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
Product-Review: Ed Schiebel <0ca8a83847a5889cf05cb219c0ab09f6b646243b@instructure.com>

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