Editor: make Ctrl-S work in input boxes

edit.js

@@ -196,7 +196,7 @@ document.addEventListener("scroll", function(e) {
 	}
 });
 
-document.addEventListener("keydown", function(e) {
+window.addEventListener("keydown", function(e) {
 	if (e.ctrlKey && !e.shiftKey && !e.altKey && !e.metaKey && e.keyCode == 83) {
 		e.preventDefault();
 		save();