Launcher: fix issue with help modal close button not working

Change-Id: I695b7116df42156a48825880ad50314490cc4d9a
diff --git a/core/installer/welcome/static/launcher.js b/core/installer/welcome/static/launcher.js
index bcc16e0..8dd4b81 100644
--- a/core/installer/welcome/static/launcher.js
+++ b/core/installer/welcome/static/launcher.js
@@ -106,8 +106,8 @@
   document.addEventListener("click", (event) => {
 	if (visibleModal === null) return;
 	const modalContent = visibleModal.querySelector("article");
-	const isClickInside = modalContent.contains(event.target);
-	if (!isClickInside) {
+	const closeButton = visibleModal.querySelector(".close-button");
+	if (!modalContent.contains(event.target) || closeButton.contains(event.target)) {
 	  closeModal(visibleModal);
 	}
   });