test: make test-tls-external-accessor agnostic

Remove reliance on V8-specific error messages in
test/parallel/test-tls-external-accessor.js.

Check that the error is a `TypeError`.

The test should now be successful without modification using ChakraCore.

PR-URL: nodejs#16272
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-tls-external-accessor.js

@@ -11,12 +11,12 @@ const tls = require('tls');
 {
   const pctx = tls.createSecureContext().context;
   const cctx = Object.create(pctx);
-  assert.throws(() => cctx._external, /incompatible receiver/);
+  assert.throws(() => cctx._external, TypeError);
   pctx._external;
 }
 {
   const pctx = tls.createSecurePair().credentials.context;
   const cctx = Object.create(pctx);
-  assert.throws(() => cctx._external, /incompatible receiver/);
+  assert.throws(() => cctx._external, TypeError);
   pctx._external;
 }