fixes PLAT-1570
test plan:
enable the disable_lti_post_only feature flag
install the test tool
create a launch with a query param
launch to newly created launch endpoint
it should launch correctly
regression test lti launches in canvas
Change-Id: I624ede3fd579a8ad7a2e6bcaa340e0b9490b9357
Reviewed-on: https://gerrit.instructure.com/81756
Tested-by: Jenkins
Reviewed-by: Brad Horrocks <bhorrocks@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Product-Review: Nathan Mills <nathanm@instructure.com>