don't make wiki sidebar tabs wrap in IE
don't make wiki sidebar tabs wrap in IE

fixes: #9244

test plan: in all the browsers you can, look
at the wiki sidebar and make sure the tabs don't
wrap to a new line

Change-Id: Ifcd630c86f97fb42a9ca2cfa463ac1cf47a2b311
Reviewed-on: https://gerrit.instructure.com/12206
Reviewed-by: Ryan Florence <2d8900489f91ac272fd9ce9d5789db6522668ca2@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>

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