JS: Add test showing misclassification of file with top-level sequence expr

Author: asgerf

javascript/ql/test/library-tests/ModuleTypes/tests.expected

@@ -8,3 +8,4 @@
 | modulePackage/tst.js:1:1:1:75 | <toplevel> | es2015 |
 | require.js:1:1:7:1 | <toplevel> | node |
 | script.js:1:1:1:35 | <toplevel> | non-module |
+| toplevel-comma.js:1:1:5:0 | <toplevel> | non-module |

javascript/ql/test/library-tests/ModuleTypes/toplevel-comma.js

@@ -0,0 +1,4 @@
+(() => {}),
+(() => {
+    const fs = require('fs');
+})();