test: check error with regex in test-signal-safety

Change TypeError to a regular expression in assert.throws() in
test/parallel/test-signal-safety.js.

PR-URL: nodejs#14285
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Gibson Fahnestock <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: James M Snell <[email protected]>

test/parallel/test-signal-safety.js

@@ -9,4 +9,4 @@ assert.throws(function() {
   const s = new Signal();
   const nots = { start: s.start };
   nots.start(9);
-}, TypeError);
+}, /^TypeError: Illegal invocation$/);