riched20: add EM_EXSETSEL conformance tests and fixes bug 4462 (revised)

[Dan Kegel]

Brian wrote:
+    /* FIXME: EM_GETSEL needs to return proper ending value */
+    todo_wine
+    {
+        ok(start == 0 && end == 18, "EM_EXSETSEL: expected (0,18)
actual:(%d,%d)\n", start,end);
+    }

What does EM_GETSEL return right now?
It might be worth looking at that to see if you can fix it in the same patch,
if it's easy.
- Dan

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