Since both functions return the exact same thing, this changeset makes `twentyseventeen_is_static_front_page()` an alias of `twentyseventeen_is_frontpage()`
and updates the related docblocks and function callback.
Props mukesh27, soulseekah, swissspidy, sabernhardt, audrasjb, SergeyBiryukov, hareesh-pillai.
Fixes#43515.
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