Use "pd" JSON API call for direct preset apply (wled#2946)

Author: Aircoookie

wled00/data/index.js

@@ -2194,12 +2194,12 @@ function setPreset(i)
 {
 	var obj = {"ps":i};
 	if (pJson && pJson[i] && (!pJson[i].win || pJson[i].win.indexOf("Please") <= 0)) {
-		// we will send complete preset content as to avoid delay introduced by
-		// async nature of applyPreset(). json.cpp has to decide wether to call applyPreset()
-		// or not (by looking at the JSON content, if "ps" only)
+		// we will send the complete preset content as to avoid delay introduced by
+		// async nature of applyPreset() and having to read the preset from file system.
+		obj = {"pd":i}; // use "pd" instead of "ps" to indicate that we are sending the preset content directly
 		Object.assign(obj, pJson[i]);
-		delete obj.ql;	// no need for quick load
-		delete obj.n;	// no need for name
+		delete obj.ql; // no need for quick load
+		delete obj.n;  // no need for name
 	}
 	if (isPlaylist(i)) obj.on = true; // force on
 	showToast("Loading preset " + pName(i) +" (" + i + ")");