sha3: enable TestUnalignedWrites

Changes function name from "testUnalignedWrites" to "TestUnalignedWrites"
which makes "go test" actually run this test.

Change-Id: Ie46f11ee1fd5c8780d5704d2fabe6ddb229262f9
Reviewed-on: https://go-review.googlesource.com/111282
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

sha3/sha3_test.go

@@ -126,7 +126,7 @@ func TestKeccakKats(t *testing.T) {
 
 // TestUnalignedWrite tests that writing data in an arbitrary pattern with
 // small input buffers.
-func testUnalignedWrite(t *testing.T) {
+func TestUnalignedWrite(t *testing.T) {
 	testUnalignedAndGeneric(t, func(impl string) {
 		buf := sequentialBytes(0x10000)
 		for alg, df := range testDigests {