Avoid full-rendering sprites a second time in the mouse map (#2189)

OpenDreamClient/Rendering/DreamPlane.cs

@@ -72,11 +72,13 @@ public void Draw(DreamViewOverlay overlay, DrawingHandleWorld handle, Box2 world
     public void DrawMouseMap(DrawingHandleWorld handle, DreamViewOverlay overlay, Vector2i renderTargetSize, Box2 worldAABB) {
         if (Master?.MouseOpacity == MouseOpacity.Transparent)
             return;
+
+        handle.UseShader(overlay.BlockColorInstance);
         foreach (var sprite in Sprites) {
             if (sprite.MouseOpacity == MouseOpacity.Transparent || sprite.ShouldPassMouse)
                 continue;
 
-            var texture = sprite.GetTexture(overlay, handle);
+            var texture = sprite.MainIcon?.LastRenderedTexture;
             if (texture == null)
                 continue;
 
@@ -90,7 +92,6 @@ public void DrawMouseMap(DrawingHandleWorld handle, DreamViewOverlay overlay, Ve
             var colorB = (byte)((hash >> 16) & 0xFF);
             Color targetColor = new Color(colorR, colorG, colorB); //TODO - this could result in mis-clicks due to hash-collision since we ditch a whole byte.
             overlay.MouseMapLookup[targetColor] = sprite;
-            handle.UseShader(overlay.BlockColorInstance); //it seems like you could put this outside the loop, but you can't without breakng the mousemap
             handle.SetTransform(DreamViewOverlay.CalculateDrawingMatrix(sprite.TransformToApply, pos, texture.Size, renderTargetSize));
             handle.DrawTextureRect(texture, new Box2(Vector2.Zero, texture.Size), targetColor);
         }