kernel32/tests: fix typo in test failure message

[Austin English]

Introduced by f555c2d8572b83595e5a9742ec4444c3ade17d3d.

-- 
-Austin
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diff --git a/dlls/kernel32/tests/thread.c b/dlls/kernel32/tests/thread.c
index 373eea7..a0cb5a1 100644
--- a/dlls/kernel32/tests/thread.c
+++ b/dlls/kernel32/tests/thread.c
@@ -955,7 +955,7 @@ static void test_SetThreadContext(void)
                          prevcount, GetLastError() );
 
     WaitForSingleObject( thread, INFINITE );
-    ok( test_value == 10, "test_value %d instead of 20\n", test_value );
+    ok( test_value == 10, "test_value %d instead of 10\n", test_value );
 
     ctx.ContextFlags = CONTEXT_FULL;
     SetLastError(0xdeadbeef);