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/thumbnails.less

@@ -1,3 +1,5 @@
+// stylelint-disable selector-no-qualifying-type
+
 //
 // Thumbnails
 // --------------------------------------------------
@@ -17,8 +19,8 @@
   > img,
   a > img {
     &:extend(.img-responsive);
-    margin-left: auto;
     margin-right: auto;
+    margin-left: auto;
   }
 
   // Add a hover state for linked versions only