Fix a problem where the Project Settings window would not display correctly when opening PICO Platform Settings

Author: stv233

Platform/Editor/PlatformConfig.cs

@@ -277,7 +277,7 @@ void OnGUI()
                 GUILayout.Space(5);
                 GUILayout.Label(new GUIContent(strBuildSettingText[(int) language], strBuildSettingHelpText[(int) language]));
 
-                GUIStyle style = "frameBox";
+                GUIStyle style = new GUIStyle("frameBox");
                 style.fixedWidth = frameWidth;
                 EditorGUILayout.BeginVertical(style);