fix(specs): allow search params as object for sffv

Author: kai687

specs/search/paths/search/searchForFacetValues.yml

@@ -33,7 +33,7 @@ post:
           additionalProperties: false
           properties:
             params:
-              $ref: '../../../common/schemas/SearchParams.yml#/paramsAsString'
+              $ref: '../../../common/schemas/SearchParams.yml#/searchParams'
             facetQuery:
               $ref: '../../common/schemas/SearchQuery.yml#/facetQuery'
             maxFacetHits: