fix Windows config dir: use %APPDATA% env var directly

FPC's GetAppConfigDir on Windows falls back to the exe directory
if the shell API call fails, which breaks installs in Program Files.
Read %APPDATA% from the environment variable instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PlatformUtils.pas

@@ -68,7 +68,16 @@ end;
 
 function GetAppCfgDir: string;
 begin
+{$IFDEF WINDOWS}
+  Result := GetEnvironmentVariable('APPDATA');
+  if Result = '' then
+    Result := GetEnvironmentVariable('LOCALAPPDATA');
+  if Result = '' then
+    Result := ExtractFilePath(ParamStr(0));
+  Result := IncludeTrailingPathDelimiter(Result) + 'ewsdr' + PathDelim;
+{$ELSE}
   Result := IncludeTrailingPathDelimiter(GetAppConfigDir(False));
+{$ENDIF}
   if not DirectoryExists(Result) then
     ForceDirectories(Result);
 end;