Fix undefined error for showSunTime / showMoonTime in clock module (#3146)

Fixes #3143 and adds tests for showSunTime / showMoonTime

tests/configs/modules/clock/clock_showSunMoon.js

@@ -0,0 +1,24 @@
+/* MagicMirror² Test config for default clock module
+ *
+ * By Johan Hammar
+ * MIT Licensed.
+ */
+let config = {
+	timeFormat: 12,
+
+	modules: [
+		{
+			module: "clock",
+			position: "middle_center",
+			config: {
+				showSunTimes: true,
+				showMoonTimes: true
+			}
+		}
+	]
+};
+
+/*************** DO NOT EDIT THE LINE BELOW ***************/
+if (typeof module !== "undefined") {
+	module.exports = config;
+}