Remove duplicate test string authenticator_basic_label

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<resources>

    <string name="test_string">TEST STRING</string>

    <string name="authenticator_basic_label">Test adapter</string>

</resources>

    <string name="attribution_twitter">Twitter</string>

    <string name="authenticator_basic_label">Test adapter</string>

    <string name="test_string">TEST STRING</string>

</resources>