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/clearfix.less

@@ -13,8 +13,8 @@
 .clearfix() {
   &:before,
   &:after {
-    content: " "; // 1
     display: table; // 2
+    content: " "; // 1
   }
   &:after {
     clear: both;