Enable drop file events

src/compositor.c

@@ -36,6 +36,8 @@ i32 run_main_loop(void) {
 
   comp.running = true;
 
+  SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
+
   colour_t bg_colour = {.abgr = 0xffffffff};
   colour_t fg_colour = {.abgr = 0xff000000};