REST: fix previous locations for refs-only load (#7284)

Author: bryanck

core/src/main/java/org/apache/iceberg/rest/RESTSessionCatalog.java

@@ -334,6 +334,7 @@ public Table loadTable(SessionContext context, TableIdentifier identifier) {
       tableMetadata =
           TableMetadata.buildFrom(response.tableMetadata())
               .withMetadataLocation(response.metadataLocation())
+              .setPreviousFileLocation(null)
               .setSnapshotsSupplier(
                   () ->
                       loadInternal(context, identifier, SnapshotMode.ALL)