Only display 15 nodes in the Recent section of the Create New Node dialog

This prevents the history size from becoming too large, which made it less
useful.

This also fixes an off-by-one error in the completion scoring algorithm.

editor/create_dialog.cpp

@@ -370,7 +370,8 @@ float CreateDialog::_score_type(const String &p_type, const String &p_search) co
 
 	// Look through at most 5 recent items
 	bool in_recent = false;
-	for (int i = 0; i < MIN(5, recent->get_item_count()); i++) {
+	constexpr int RECENT_COMPLETION_SIZE = 5;
+	for (int i = 0; i < MIN(RECENT_COMPLETION_SIZE - 1, recent->get_item_count()); i++) {
 		if (recent->get_item_text(i) == p_type) {
 			in_recent = true;
 			break;
@@ -406,7 +407,8 @@ void CreateDialog::_confirmed() {
 		if (f.is_valid()) {
 			f->store_line(selected_item);
 
-			for (int i = 0; i < MIN(32, recent->get_item_count()); i++) {
+			constexpr int RECENT_HISTORY_SIZE = 15;
+			for (int i = 0; i < MIN(RECENT_HISTORY_SIZE - 1, recent->get_item_count()); i++) {
 				if (recent->get_item_text(i) != selected_item) {
 					f->store_line(recent->get_item_text(i));
 				}