lib: refactor bootstrap_node.js regular expression

* use `+` instead of `*` where one-or-more is required
* switch from String.prototype.match() to RegExp.prototype.test()

PR-URL: nodejs#10749
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Jackson Tian <shyvo1987@gmail.com>

lib/internal/bootstrap_node.js

@@ -393,9 +393,7 @@
   }
 
   function isDebugBreak() {
-    return process.execArgv.some((arg) => {
-      return arg.match(/^--debug-brk(=[0-9]*)?$/);
-    });
+    return process.execArgv.some((arg) => /^--debug-brk(=[0-9]+)?$/.test(arg));
   }
 
   function run(entryFunction) {