powerrename: fix union usage (#42845)

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## Summary of the Pull Request

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## PR Checklist

- [x] Closes: #42843
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass

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## Detailed Description of the Pull Request / Additional comments
fix undefined behavior when using union in the `IFACEMETHODIMP
CPowerRenameRegEx::PutFileTime(_In_ SYSTEMTIME fileTime)` function

a69f7fa806/src/modules/powerrename/lib/PowerRenameRegEx.cpp (L299)

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## Validation Steps Performed

src/modules/powerrename/lib/PowerRenameRegEx.cpp

@@ -344,19 +344,13 @@ IFACEMETHODIMP CPowerRenameRegEx::PutFlags(_In_ DWORD flags)
 
 IFACEMETHODIMP CPowerRenameRegEx::PutFileTime(_In_ SYSTEMTIME fileTime)
 {
-    union timeunion
-    {
-        FILETIME fileTime;
-        ULARGE_INTEGER ul;
-    };
+    FILETIME ft1;
+    FILETIME ft2;
 
-    timeunion ft1;
-    timeunion ft2;
+    SystemTimeToFileTime(&m_fileTime, &ft1);
+    SystemTimeToFileTime(&fileTime, &ft2);
 
-    SystemTimeToFileTime(&m_fileTime, &ft1.fileTime);
-    SystemTimeToFileTime(&fileTime, &ft2.fileTime);
-
-    if (ft2.ul.QuadPart != ft1.ul.QuadPart)
+    if (ft2.dwLowDateTime != ft1.dwLowDateTime || ft2.dwHighDateTime != ft1.dwHighDateTime)
     {
         m_fileTime = fileTime;
         m_useFileTime = true;