fixup: exclude node_modules/ for crash detection

node.js client uses lodash which has core.js.

test/helpers.lua

@@ -259,7 +259,7 @@ local function check_cores(app, force)
   else
     initial_path = '.'
     re = '/core[^/]*$'
-    exc_re = { '^/%.deps$', local_tmpdir }
+    exc_re = { '^/%.deps$', local_tmpdir, '^/%node_modules$' }
     db_cmd = gdb_db_cmd
     random_skip = true
   end