fix: set gl context before freeing shaders

src/forge.c

@@ -387,8 +387,6 @@ static void shutdown() {
     state_save(&context, project.state_config);
   }
 
-  shaders_free(&program);
-
   if (window_output != NULL) {
     window_use(window_output, &context);
 
@@ -401,6 +399,8 @@ static void shutdown() {
     shaders_free_window(&program, init_params.output);
   }
 
+  shaders_free(&program);
+
 #ifdef VIDEO_IN
   free_video_captures();
 #endif /* VIDEO_IN */