Update sky_stomry04_hdr download details

Uploaded the wrong zip. Sorry about that folks

Author: Jacobdeanr

public/data/sky_stormy04_hdr.json

@@ -41,7 +41,7 @@
     "source": {
       "file": "sky_stormy04_hdr.7z",
       "format": "Source engine",
-      "size": "6.6MB"
+      "size": "7.5MB"
     },
     "exr": {
       "file": "sky_stormy04_hdr.exr",