Match DoubleRadixSort test name to file name

Summary: As per title

Reviewed By: yfeldblum

Differential Revision: D25636982

fbshipit-source-id: a59c2325558175e122941000ab645c8735a3a425

folly/stats/detail/test/RadixSortTest.cpp → folly/stats/detail/test/DoubleRadixSortTest.cpp

@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 
+#include <folly/stats/detail/DoubleRadixSort.h>
+
 #include <folly/Random.h>
 #include <folly/portability/GTest.h>
-#include <folly/stats/detail/DoubleRadixSort.h>
 
 using namespace folly::detail;