fix: forgor to allocate gpu memory

src/gui/MainWindow.cpp

@@ -1,5 +1,6 @@
 #include "MainWindow.h"
 
+#include "cuda_runtime.h"
 #include <iostream>
 #include <memory>
 
@@ -56,7 +57,7 @@ int Window::init(float* data) {
     Window::tick();
   }
 
-  Window::free();
+  Window::free(data);
   return 0;
 }
 
@@ -73,10 +74,11 @@ int Window::init_quad(float* data) {
 }
 
 
-void Window::free() {
+void Window::free(float* data) {
   // To preserve the proper destruction order we forcefully set the quads to null (calling their destructor in the process)
   // Not strictly necessary, but i saw some weird errors on exit without this so best to keep it in.
   this->current_quad = nullptr;
+  cudaFree(data);
 
   glfwDestroyWindow(window);
   glfwTerminate();