chore(css): remove support for white-space-collapse: discard (#869)

Author: skyclouds2001

css/properties.json

@@ -10665,7 +10665,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/white-space"
   },
   "white-space-collapse": {
-    "syntax": "collapse | discard | preserve | preserve-breaks | preserve-spaces | break-spaces",
+    "syntax": "collapse | preserve | preserve-breaks | preserve-spaces | break-spaces",
     "media": "visual",
     "inherited": true,
     "animationType": "discrete",