Fix wxUILocale::GetPreferredUILanguages() under Windows < 10

Return the default locale name under old Windows versions instead of
always returning an empty vector and logging a spurious error.

See #23416.

(cherry picked from commit a242283456ffd0920a2384f6fee45d56a7ecc3a5)

docs/changes.txt

@@ -254,6 +254,7 @@ wxMSW:
 
 - Fix setting locale for wxLANGUAGE_UKRAINIAN (Ulrich Telle, #23210).
 - Don't reset custom wxToolBar background on system colour change (#23386).
+- Fix wxUILocale::GetPreferredUILanguages() under < 10 (Brian Nixon, #23416).
 
 wxOSX:
 

src/msw/uilocale.cpp

@@ -456,7 +456,7 @@ public:
             {
                 // Use the default user locale for Windows 7 resp Windows 8.x and below
                 wchar_t buf[LOCALE_NAME_MAX_LENGTH];
-                if (!ms_GetUserDefaultLocaleName(buf, LOCALE_NAME_MAX_LENGTH))
+                if (ms_GetUserDefaultLocaleName(buf, LOCALE_NAME_MAX_LENGTH))
                 {
                     preferred.push_back(buf);
                 }