Fix GraalVM native image error using EnableSpringDataWebSupport

[christophstrobl]

A change in e074fcc seems to now cause problems with the native image support (related to oracle/graal#6510) resulting in

om.oracle.svm.core.util.VMError$HostedError: New Method or Constructor found as reachable after static analysis: public org.springframework.data.web.config.EnableSpringDataWebSupport$PageSerializationMode org.springframework.data.web.config.SpringDataWebSettings.pageSerializationMode()