Fix file test to test for both decomposed and precomposed utf16

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 129a73f22ddbcd744168d83f7e492ef7576c3a1a..c34fb1c333babdada75a49952bcd262acacbf9f4 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -30,10 +30,6 @@ io/test_runner_test: Pass, Fail  # Issue 1947
 # of allowed open files ('ulimit -n' says something like 256).
 io/socket_many_connections_test: Skip
 
-io/file_non_ascii_sync_test: Fail  # issue 6702
-io/directory_non_ascii_sync_test: Fail  # issue 6702
-io/process_non_ascii_test: Fail  # issue 6702
-
 [ $runtime == vm && $system == windows ]
 io/file_system_links_test: Skip  # No links on Windows.