Update ufo example data

Downloaded a newer version of the data from
https://www.kaggle.com/datasets/NUFORC/ufo-sightings?select=scrubbed.csv
and fixed the remaining errors in it.

examples/icon-sprite-webgl.js

@@ -124,12 +124,6 @@ client.onload = function () {
     prevIndex = curIndex + 1;
 
     const coords = fromLonLat([parseFloat(line[5]), parseFloat(line[4])]);
-
-    // only keep valid points
-    if (isNaN(coords[0]) || isNaN(coords[1])) {
-      continue;
-    }
-
     const shape = line[2];
     shapeTypes[shape] = (shapeTypes[shape] ? shapeTypes[shape] : 0) + 1;
     shapeTypes['all']++;