Correcting field name

(cherry picked from commit 68407c8117ebcd2f130482cece80944a2beddce2)

Source commit: 3c15a57ff30633c1dfa9f7dfe0ad4b1d170f4928

source/core/Common.cpp

@@ -1401,7 +1401,7 @@ bool __fastcall IsHex(wchar_t Ch)
 TSearchRecSmart::TSearchRecSmart()
 {
   FLastWriteTimeSource.dwLowDateTime = 0;
-  FLastWriteTimeSource.dwLowDateTime = 0;
+  FLastWriteTimeSource.dwHighDateTime = 0;
 }
 //---------------------------------------------------------------------------
 TDateTime TSearchRecSmart::GetLastWriteTime() const