fix aspect ratio in camera on window show / app start

liblava/app/app.cpp

@@ -114,6 +114,9 @@ namespace lava {
         if (!camera.create(device))
             return false;
 
+        camera.aspect_ratio = window.get_aspect_ratio();
+        camera.update_projection();
+
         if (!create_gui())
             return false;
 

liblava/frame/window.cpp

@@ -86,6 +86,8 @@ namespace lava {
         switch_mode_request_active = false;
         handle_message();
 
+        get_framebuffer_size(framebuffer_width, framebuffer_height);
+
         return true;
     }