Fix crash in wxLogGui when wxUSE_LOG_DIALOG==0

This fixes a crash when DoShowMultipleLogMessages() is called with
wxUSE_LOG_DIALOG set to 0. The code after the #else statement gets the
size of the wxArrayString but then instead of accessing that array, it
tried to access the m_aMessages array which is empty, resulting in a
crash in the C runtime. This commit simply gets the strings from the
correct array.

Closes #24087.

src/generic/logg.cpp

@@ -266,7 +266,7 @@ wxLogGui::DoShowMultipleLogMessages(const wxArrayString& messages,
     const size_t nMsgCount = messages.size();
     message.reserve(nMsgCount*100);
     for ( size_t n = nMsgCount; n > 0; n-- ) {
-        message << m_aMessages[n - 1] << wxT("\n");
+        message << messages[n - 1] << wxT("\n");
     }
 
     DoShowSingleLogMessage(message, title, style);