fix improper initialisation

src/js/rulesAutosurgery.tw

@@ -3,11 +3,12 @@
 window.rulesAutosurgery = (function() {
 	"use strict";
 	let V;
-	let r = "";
+	let r;
 	return rulesAutoSurgery;
 
 	function rulesAutoSurgery(slave) {
 		V = State.variables;
+		r = "";
 		const surgeries = [];
 		const thisSurgery = ProcessHGTastes(slave);
 		if (slave.health > 20)