fix: fix broken meta tag for twitter image

[LoganDupont]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngneat/transloco/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Due to a previous PR #389 I broke the meta-tag for twitter:image and replaced it with x:image which doesn't exist

Issue Number: N/A

What is the new behavior?

I reverted the changes that broke the meta-tag for twitter:image

Does this PR introduce a breaking change?

• Yes
• No

Other information

/

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[geromegrignon]

thanks for the fix