[PATCH] shlwapi/tests: Avoid casts from COM object to interface

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=96352

Your paranoid android.


=== debiant2 (32 bit Hindi:India report) ===

shlwapi:
ordinal.c:1727: Test failed: expected ( ), got (03:16)
ordinal.c:1734: Test failed: expected ( ), got (03:16:09)
ordinal.c:1742: Test failed: expected ( ), got (03:16:09)
ordinal.c:1749: Test failed: expected ( ), got (26-08-2021)
ordinal.c:1756: Test failed: expected ( ), got (26 ????? 2021)
ordinal.c:1764: Test failed: expected ( ), got (26 ????? 2021)
ordinal.c:1772: Test failed: expected (F), got (6) for time part
ordinal.c:1786: Test failed: expected (F), got (9) for time part
ordinal.c:1804: Test failed: expected (  F), got (26-08-2021 03:16)
ordinal.c:1815: Test failed: expected (  F F), got (26-08-2021 03:16:09)