Spreadsheet: fix header uniformity

+ trailing whitespace

src/Mod/Spreadsheet/App/PropertySheetPyImp.cpp

@@ -38,7 +38,7 @@ std::string PropertySheetPy::representation(void) const
 
 PyObject *PropertySheetPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper
 {
-    // create a new instance of PropertySheetPy and the Twin object 
+    // create a new instance of PropertySheetPy and the Twin object
     return new PropertySheetPy(new PropertySheet);
 }
 
@@ -60,5 +60,5 @@ PyObject *PropertySheetPy::getCustomAttributes(const char* /*attr*/) const
 
 int PropertySheetPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
 {
-    return 0; 
+    return 0;
 }