test: replace CRLF by LF in a fixture

test/fixtures/test-error-first-line-offset.js is used in the
test/sequential/test-module-loading.js, but the line break type
is insignificant. It can be replaced for consistency.

PR-URL: #14437
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>

test/fixtures/test-error-first-line-offset.js

@@ -1 +1 @@
-error
+error