[NOTEPAD] Improve the "About" dialog status. (#610)

- Remove the non-standard "About" dialog.
- Move the authors copyright info into the shell "About "dialog.

base/applications/notepad/main.c

@@ -87,14 +87,6 @@ static int NOTEPAD_MenuCommand(WPARAM wParam)
     case CMD_STATUSBAR: DIALOG_ViewStatusBar(); break;
 
     case CMD_HELP_CONTENTS: DIALOG_HelpContents(); break;
-
-    case CMD_ABOUT:
-        DialogBox(GetModuleHandle(NULL),
-                  MAKEINTRESOURCE(IDD_ABOUTBOX),
-                  Globals.hMainWnd,
-                  AboutDialogProc);
-        break;
-
     case CMD_HELP_ABOUT_NOTEPAD: DIALOG_HelpAboutNotepad(); break;
 
     default: