Base: Use explicit pointer syntax for freecad_cast (#20694)

* Base: Use explicit pointer syntax for freecad_cast

This aligns our custom cast with other casts

* All: Use explicit pointer syntax for freecad_cast

src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.cpp

@@ -146,7 +146,7 @@ void ViewProviderSheet::setupContextMenu(QMenu* menu, QObject* receiver, const c
 
 Sheet* ViewProviderSheet::getSpreadsheetObject() const
 {
-    return freecad_cast<Sheet>(pcObject);
+    return freecad_cast<Sheet*>(pcObject);
 }
 
 void ViewProviderSheet::beforeDelete()