just a minor refactor, nothing special

src/graphics/core/Viewport.cpp

@@ -1,4 +1,4 @@
-#include "Viewport.h"
+#include "Viewport.hpp"
 
 Viewport::Viewport(uint width, uint height) 
     : width(width), height(height) {
@@ -10,4 +10,4 @@ uint Viewport::getWidth() const {
 
 uint Viewport::getHeight() const {
     return height;
-}
+}