fix: Fix display of portlets in sections in Mobile mode - MEED-7079 - M…

…eeds-io/meeds#2183 (#792)

Prior to this change, the padding on sections plus the margin on
applications inside the section makes the spacing between applications
very large. This change will delete the margin on the last application
of a given section to let the padding of the section applied only.

platform-ui-skin/src/main/webapp/skin/less/core/layout/pagelayout.less

@@ -132,11 +132,15 @@
     .PORTLET-FRAGMENT {
       margin-bottom: ~"var(--grid-layout-gap, 20px)";
     }
+
     .flex-cell {
       row-gap: 0;
       .layout-application {
         padding-bottom: 0 !important;
       }
+      > :last-of-type .PORTLET-FRAGMENT {
+        margin-bottom: 0;
+      }
     }
     .layout-section-mobile-pages {
       position: relative;