fix(transloco): 🐛 fixed generated scope name in subdirectories

[JordanW9232]

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?

Issue Number: 559

What is the new behavior?

Using a file in a nested directory such as "i18n/nested-scopes/admin-page/en.json" will generate the scope name as "nestedScope.adminPage" rather than "nestedScopeAdminPage".

Does this PR introduce a breaking change?

• Yes
• No

Other information

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[shaharkazaz]

@JordanW9232 Please refer to my comment here