Fixed: Modal scrolling causing app to scroll on iOS

Co-Authored-By: Mark McDowall <markus101@users.noreply.github.com>

frontend/src/Utilities/mobile.js

@@ -0,0 +1,12 @@
+import MobileDetect from 'mobile-detect';
+
+const mobileDetect = new MobileDetect(window.navigator.userAgent);
+
+export function isMobile() {
+
+  return mobileDetect.mobile() != null;
+}
+
+export function isIOS() {
+  return mobileDetect.is('iOS');
+}