remove unused function

src/util/useLightMap.ts

@@ -55,23 +55,6 @@ export default function useLightMap(
     ctx.fillRect(0, 0, W, H)
   }
 
-  function drawShadows() {
-    const barrier = lightBarrier.value
-
-    ctx.fillStyle = '#000A'
-    for (let col = 0; col < W / B; col++) {
-      const level = (barrier[col] - y.value) * B
-      const sw = B
-      const sh = H - level
-      const sx = col * sw
-      const sy = level
-
-      ctx.fillRect(sx, sy, sw, sh)
-      ctx.fillRect(sx, sy + 20, sw, sh)
-      ctx.fillRect(sx, sy + 40, sw, sh)
-    }
-  }
-
   function drawLights() {
     // used for everything above ground
     const ambientLight = getAmbientLightColor()