Remove unnecessary type="text/javascript" attributes from <script> tags (W3C validation warning)

[masteradhoc]

Step to achieve #63

What?

This PR removes redundant type="text/javascript" attributes from inline <script> tags across the Two-Factor plugin to resolve W3C validation warnings.

---

Why?

Under HTML5, text/javascript is the default value for <script> elements. Explicitly defining it is unnecessary and produces validation warnings such as:

“The type attribute is unnecessary for JavaScript resources.”

Removing the attribute improves standards compliance and eliminates avoidable validation noise without changing behavior.

---

How?

All instances of:

<script type="text/javascript">

were replaced with:

<script>

Updated files:

• class-two-factor-core.php
• providers/class-two-factor-backup-codes.php
• providers/class-two-factor-email.php
• providers/class-two-factor-totp.php

No JavaScript logic or execution flow was modified. Only the redundant attribute was removed.

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Testing Instructions

1. Apply the patch.
2. run pages through validator
3. make sure we dont have this error
   "The type attribute is unnecessary for JavaScript resources warning."

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Screenshots or screencast

Not applicable (markup-only standards compliance update).

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Changelog Entry

Changed - Removed unnecessary type="text/javascript" attributes from script tags for HTML5 compliance.

[github-actions]

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Co-authored-by: masteradhoc <masteradhoc@git.wordpress.org>
Co-authored-by: georgestephanis <georgestephanis@git.wordpress.org>

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[georgestephanis]

It's optional in html5 by my understanding, and if omitted is the fallback to text/javascript mime type. Probably safe to drop, but there's also no real harm in having it. I'm fine with either.

[masteradhoc]

@georgestephanis tried to be inline with WP 7.0 where this will get dropped as well :) https://core.trac.wordpress.org/changeset/61440