esm: fix duplicated test
This PR does some housekeeping:
-
test/es-module/test-esm-specifiers-legacy-flag.mjs
duplicates the first test block intest/es-module/test-esm-specifiers.mjs
, but the latter is newer so I’m deleting the former - The additions to
test/es-module/test-esm-specifiers-legacy-flag.mjs
in https://github.com/nodejs/node/commit/4e17ffc793a2a484f376f8f696a2ea80eabb437d should have been made totest/es-module/test-esm-specifiers.mjs