fix mock server content type expectation for sparql form post

this ensures the mock server also accepts content-type with charset=UTF-8 appended

Author: dennisvang

src/main/java/org/fairdatateam/fairdatapoint/api/controller/search/SearchSparqlController.java

@@ -50,7 +50,6 @@
 import java.net.URI;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 import java.util.Optional;
 import java.util.function.Consumer;
 

src/test/java/org/fairdatateam/fairdatapoint/acceptance/search/sparql/SearchSparqlControllerTest.java

@@ -189,7 +189,7 @@ public void proxyForwardingWorksForPostFormRequests() {
         this.mockBackendSparqlServer
                 .expect(requestTo(TEST_SPARQL_ENDPOINT_URL))
                 .andExpect(method(HttpMethod.POST))
-                .andExpect(content().contentType(MediaType.APPLICATION_FORM_URLENCODED))
+                .andExpect(content().contentTypeCompatibleWith(MediaType.APPLICATION_FORM_URLENCODED))
                 // form data from original request must arrive at server unaltered (except for empty lists)
                 .andExpect(content().formData(formData))
                 .andRespond(withSuccess().body(mockJsonBody));