Fix resolveuid links also for Link urls

[coveralls]

Pull Request Test Coverage Report for Build 6009107036

• 8 of 11 (72.73%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.7%) to 62.969%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/redturtle/volto/restapi/serializer/summary.py	4	5	80.0%
src/redturtle/volto/restapi/serializer/dxfields.py	1	3	33.33%
<!--	Total:	8	11	72.73%	-->

Files with Coverage Reduction	New Missed Lines	%
src/redturtle/volto/restapi/serializer/dxfields.py	1	84.21%
<!--	Total:	1		-->

Totals
Change from base Build 6009101417:	0.7%
Covered Lines:	755
Relevant Lines:	1199

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💛 - Coveralls