win: Send a KEYEVENTF_KEYUP when releasing a Unicode Key as well

src/win/win_impl.rs

@@ -274,8 +274,7 @@ impl Keyboard for Enigo {
                     KEYEVENTF_UNICODE | KEYEVENTF_KEYUP,
                     // Must be zero
                     VIRTUAL_KEY(0),
-                    // TODO: Explain why this is not utf16_surrogate
-                    result[0],
+                    utf16_surrogate,
                     self.dw_extra_info,
                 ));
             }