Bug 1783843 - Remove the workaround to support Glean in libs

[Dexterp37]

The Glean SDKs now corrently deal with missing VERSION_CODE and VERSION_NAME fields in BuildConfig. See https://bugzilla.mozilla.org/show_bug.cgi?id=1713084. This workaround is no longer needed.

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• [ ] Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
• [ ] Tests: This PR includes thorough tests or an explanation of why it does not
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