[libromdata] WimPrivate::addFields_XML(): Fix copy/paste error for FILETIMEs.

Both lastmodtime_high and lastmodtime_low were being initialized to
strtoul(s_highPart, ...).

Testing Windows 10 (10.0.19041.5363) recovery image: (winre.wim)
- HIGHPART: 0x01D5ACCD
- LOWPART:  0x97A856C3
- Decimal: 132201763089962691

Timestamp conversions before and after: (using TZ=UTC)
- Before: 12/07/2019 07:07:37 AM
- After:  12/07/2019 07:11:48 AM

Manually converting it using a website:
- Saturday, December 7, 2019 7:11:48 AM

TODO: Split the XML code into a separate .cpp file and add DelayLoad checks.

NEWS.md

@@ -64,6 +64,10 @@
     field is a "warning" field.
   * DpfReader: Fixed a regression that broke reading RPF files.
     * Affects: v2.4 - v2.4.1
+  * Wim: Fix image timestamp parsing. Previously, the "HIGHPART" was used
+    for both the high and low 32 bits. The date would usually be correct,
+    but the timestamp would be off by minutes. Both "HIGHPART" and "LOWPART"
+    are now correctly used to build the 64-bit FILETIME timestamp.
 
 * Other changes:
   * CMake: Added an ENABLE_NETWORKING option to control whether or not

src/libromdata/Media/Wim.cpp

@@ -249,7 +249,7 @@ int WimPrivate::addFields_XML()
 				if (s_highPart && s_lowPart) {
 					// Parse HIGHPART and LOWPART, then combine them like FILETIME.
 					const uint32_t lastmodtime_high = strtoul(s_highPart, nullptr, 16);
-					const uint32_t lastmodtime_low = strtoul(s_highPart, nullptr, 16);
+					const uint32_t lastmodtime_low = strtoul(s_lowPart, nullptr, 16);
 					currentindex.lastmodificationtime = WindowsSplitTimeToUnixTime(lastmodtime_high, lastmodtime_low);
 				}
 			}