Merge used libraries for Barcode/QR-Code generation

public/viewjs/calendar.js

@@ -33,7 +33,7 @@ $("#ical-button").on("click", function(e)
 			bootbox.alert({
 				title: __t('Share/Integrate calendar (iCal)'),
 				message: __t('Use the following (public) URL to share or integrate the calendar in iCal format') + '<input type="text" class="form-control form-control-sm mt-2 easy-link-copy-textbox" value="' + result.url + '"><p class="text-center mt-4">'
-					+ getQRCodeForContent(result.url) + "</p>",
+					+ QrCodeImgHtml(result.url) + "</p>",
 				closeButton: false
 			});
 		},