Long filename overflows the Move File window
Long filename overflows the Move File window

Fixes: CNVS-22070

Test Plan:
	- Go to files page
	- Add a file with long title
	- When the title is exceptionally long,
	  it will not overflow out of the
	  modal header. (The situation here
	  http://screencast.com/t/BICD4QFtRfH
	  should no longer occur)

Change-Id: I1ba1f65281aaa4cc7be39cc89c8c372a6e64c23d
Reviewed-on: https://gerrit.instructure.com/59209
Tested-by: Jenkins
Reviewed-by: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>
Product-Review: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>
QA-Review: Jahnavi Yetukuri <ed2b2672ccc2e59e56c0615df7f01b579202e014@instructure.com>

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