put type=button on a bunch of stuff

many a bug has come from people not putting a
'type' on their buttons. usually it comes from IE
treating a button with no type different from other
browsers.  so always specify a button type and
you'll avoid these types of buttons

test plan:
nothing should change

Change-Id: Ia712da602a3cbd840276c892531b3b77cb4a0df3
Reviewed-on: https://gerrit.instructure.com/43546
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Dan Minkevitch <dan@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>
QA-Review: Ryan Shaw <ryan@instructure.com>