Fix package.json search for JavaScript

[rudolf101]

Description

When the plugin has been reinstalled with IDEA restart and project clean & experimental languages support enabled, the action called for the JS file works properly.

Fixes #1947

How to test

Manual tests

Follow this steps:

• Install plugin
• Reinstall plugin with IDEA restart
• Clean project, make sure that utbot_settings.xml is deleted after deinstallation of previously installed plugin
• Turn on experimental languages support
• Find the examples in the folder `/utbot-js/samples' and try to run UTBot.

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.

[Markoutte]

Better way to handle this problem is to put projectPath into File object and compare files instead of strings. Try this:

        File file = new File("C:/Windows/Resources");
        File f = new File("C:\\Windows\\Resources");
        System.out.println(Objects.equals(file, f));

Or with newer API (Also, I show prev example with normalization only for example):

        Path file = Paths.get("C:/Windows/Resources/Themes/..").normalize();
        Path f = Paths.get("C:\\Windows\\Resources").normalize();
        System.out.println(Objects.equals(file, f));