d3d8/tests: skip the visual test if d3d cannot be initialized

[Austin English]

Current d3d8 does a win_skip(), while d3d9 does a skip(). This unifies
the behavior to match the d3d9 behavior.

-- 
-Austin
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diff --git a/dlls/d3d8/tests/visual.c b/dlls/d3d8/tests/visual.c
index e90553a..71e0026 100644
--- a/dlls/d3d8/tests/visual.c
+++ b/dlls/d3d8/tests/visual.c
@@ -2245,7 +2245,7 @@ START_TEST(visual)
     device_ptr = init_d3d8();
     if (!device_ptr)
     {
-        win_skip("Could not initialize direct3d\n");
+        skip("Could not initialize direct3d\n");
         return;
     }