add h1 heading to grading standards page
add h1 heading to grading standards page

fixes CNVS-30171

test plan:
-navigate to grading standards page (accounts/[#]/grading_standards)
-verify there is an h1 heading
-note: some accounts only have grading schemes and not grading periods
--the issue was with accounts that had both schemes and periods
--this change only affects these accounts

Change-Id: I702270b0b6c36a0c1a79cbe026c2571ec9efc20b
Reviewed-on: https://gerrit.instructure.com/83693
Reviewed-by: Matt Berns <e53c8988cd428dde240324ce2797c8eb7073560f@instructure.com>
Tested-by: Jenkins
QA-Review: Indira Pai <9d2d5fa73bc5f5239dec42fbfd2a2b8495480e96@instructure.com>
Product-Review: Christi Wruck

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