Twenty Nineteen: Page title is improperly aligned when there are no posts.

[kjellr]

On a posts feed that includes no posts, the "Nothing Found" page title does not inherit the correct margins:

This should include the same margins as the page-content, in order to appear aligned with the rest of the page content:

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Originally reported by multiformeingegno on the Twenty Nineteen GitHub:

​https://github.com/WordPress/twentynineteen/issues/741

[laurelfulford]

For the record (and commit message!) original reporter multiformeingegno's WordPress user name is lorenzone92.

[laurelfulford]

In 44652:

Twenty Nineteen: Fix alignment of page title when there are no posts.

Fix the alignment of the "Nothing Found" page title when there are no posts, to match how it appears for the search results when nothing is found, and the 404 page.

Props kjellr, lorenzone92.
Fixes #45887.

[kjellr]

#46096 was marked as a duplicate.