Fix TextureAtlas generating mipmaps when requested not to

osu.Framework/Graphics/Textures/TextureStore.cs

···
             if (useAtlas)
             {
                 int size = Math.Min(max_atlas_size, GLWrapper.MaxTextureSize);
-                Atlas = new TextureAtlas(size, size, filteringMode: filteringMode);
+                Atlas = new TextureAtlas(size, size, filteringMode: filteringMode, manualMipmaps: manualMipmaps);
             }
         }