Save form height/width when closing.

src/sbbs3/ctrl/PreviewFormUnit.cpp

@@ -152,3 +152,12 @@ void __fastcall TPreviewForm::FormShow(TObject *Sender)
     fclose(fp);
 }
 //---------------------------------------------------------------------------
+void __fastcall TPreviewForm::FormClose(TObject *Sender,
+      TCloseAction &Action)
+{
+    MainForm->SpyTerminalWidth=Width;
+    MainForm->SpyTerminalHeight=Height;
+
+}
+//---------------------------------------------------------------------------
+