Spreadsheet: fix header uniformity

+ trailing whitespace

src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp

@@ -38,7 +38,7 @@ std::string PropertyRowHeightsPy::representation(void) const
 
 PyObject *PropertyRowHeightsPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper
 {
-    // create a new instance of PropertyRowHeightsPy and the Twin object 
+    // create a new instance of PropertyRowHeightsPy and the Twin object
     return new PropertyRowHeightsPy(new PropertyRowHeights);
 }
 
@@ -55,5 +55,5 @@ PyObject *PropertyRowHeightsPy::getCustomAttributes(const char* /*attr*/) const
 
 int PropertyRowHeightsPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
 {
-    return 0; 
+    return 0;
 }