Update checklist and other fixups

src/dynamic-import/checklist.md

...mport/default/nested-arrow-assignment-expression.template

src/dynamic-import/default/nested-arrow.template

...namic-import/default/nested-async-function-await.template

...mport/default/nested-async-function-return-await.template

src/dynamic-import/default/nested-async-function.template

src/dynamic-import/default/nested-block-labeled.template

src/dynamic-import/default/nested-block.template

src/dynamic-import/default/nested-do-while.template

src/dynamic-import/default/nested-else.template

src/dynamic-import/default/nested-function.template

src/dynamic-import/default/nested-if-braceless.template

src/dynamic-import/default/nested-if.template

src/dynamic-import/default/nested-while.template

src/dynamic-import/default/top-level.template

src/dynamic-import/empty-str-is-valid-assign-expr.case

src/dynamic-import/eval-gtbndng-indirect-update-dflt.case

src/dynamic-import/instn-iee-err-not-found.case

...mic-import/catch/instn-iee-err-not-found-empty_FIXTURE.js