(less) remove default left-right print margins per upstream h5bp change

Refs:
    h5bp/html5-boilerplate@57be193
    h5bp/html5-boilerplate#1477

Author: cvrebert

print.less

@@ -50,10 +50,6 @@
     max-width: 100% !important;
   }
 
-  @page {
-    margin: 2cm .5cm;
-  }
-
   p,
   h2,
   h3 {
@@ -76,6 +72,10 @@
   .navbar {
     display: none;
   }
+  @page {
+    margin-top:    2cm;
+    margin-bottom: 2cm;
+  }
   .table {
     td,
     th {