Update AdminLTE

- from 2.4.5 to 2.4.18 (cannot detect any issues)
- set default scancycle for Apple Devices to 1

front/lib/AdminLTE/bower_components/bootstrap/less/mixins/responsive-visibility.less

@@ -1,7 +1,5 @@
-// Responsive utilities
+// stylelint-disable declaration-no-important
 
-//
-// More easily include all the states for responsive-utilities.less.
 .responsive-visibility() {
   display: block !important;
   table&  { display: table !important; }