No extra call for Refresh of the TSCanvas/Scrolled Windows

`Document::Refresh()` corresponds to only one document, so only
its corresponding Scrolled Window needs to be refreshed, but not
all the other Scrolled Windows in the Notebook.

This removes the call for the Refresh of the Notebook as this propagates
to all children (Scrolled Windows).

src/document.h

@@ -724,22 +724,19 @@ struct Document {
     }
 
     void Refresh() {
-        hover.g = nullptr;
-        redrawpending = true;
-        #ifndef __WXMSW__
-        if (sw) sw->Refresh(false);
-        #endif
-        #ifdef __WXGTK__
         if (sw) {
-            // wxWidgets (wxGTK) does not always automatically update the scrollbar 
-            // to new canvas size and current position within after zoom so force it manually
-            int curx, cury;
-            sw->GetViewStart(&curx, &cury);
-            sw->SetScrollbars(1, 1, layoutxs, layoutys, curx, cury, true);
+            hover.g = nullptr;
+            redrawpending = true;
+            sys->UpdateStatus(selected);
+            sw->Refresh(false);
+            #ifdef __WXGTK__
+                // wxWidgets (wxGTK) does not always automatically update the scrollbar 
+                // to new canvas size and current position within after zoom so force it manually
+                int curx, cury;
+                sw->GetViewStart(&curx, &cury);
+                sw->SetScrollbars(1, 1, layoutxs, layoutys, curx, cury, true);
+            #endif
         }
-        #endif
-        sys->UpdateStatus(selected);
-        sys->frame->nb->Refresh(false);
     }
 
     void ClearSelectionRefresh() {