gui: get special folder in unicode

src/util.cpp

@@ -1118,14 +1118,14 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
 #ifdef WIN32
 fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 {
-    char pszPath[MAX_PATH] = "";
+    WCHAR pszPath[MAX_PATH] = L"";
 
-    if(SHGetSpecialFolderPathA(nullptr, pszPath, nFolder, fCreate))
+    if(SHGetSpecialFolderPathW(nullptr, pszPath, nFolder, fCreate))
     {
         return fs::path(pszPath);
     }
 
-    LogPrintf("SHGetSpecialFolderPathA() failed, could not obtain requested path.\n");
+    LogPrintf("SHGetSpecialFolderPathW() failed, could not obtain requested path.\n");
     return fs::path("");
 }
 #endif