Update Twitter Labels and URL to X

[masteradhoc]

Fixes #2918

(No linked issue — minor UX/branding update)

Changes Proposed in this Pull Request

• Updated the company Twitter profile link URL from https://twitter.com/ to https://x.com/ in the_company_twitter().
• Updated user-facing label strings from "Twitter username" to "X / Twitter username" (job submission form) and "Company Twitter" to "Company X / Twitter" (admin meta box, personal data export) to reflect the platform rebrand.

Testing Instructions

1. Create or edit a job listing and add a value to the X / Twitter username field — confirm the label reads "X / Twitter username".
2. Save and view the single job listing on the frontend.
3. Confirm the Twitter/X link in the company info box points to https://x.com/<username> rather than https://twitter.com/<username>.
4. In wp-admin, open the job listing post editor and confirm the meta field label reads "Company X / Twitter".
5. Go to Tools → Erase Personal Data, request an export for a user with a job listing that has a Twitter handle, and confirm the exported label reads "Company X / Twitter".

Release Notes

• Updated Twitter profile links to use the new x.com domain and updated related labels to "X / Twitter" to reflect the platform rebrand.

New or Updated Hooks and Templates

None.

Deprecated Code

None.

Screenshot / Video

(Label and link change are text-only — no visual screenshot required)