MDL-54654 book: silence csslint warning

(Important is by design for print layout)

diff --git a/mod/book/tool/print/print.css b/mod/book/tool/print/print.css
index 90d7153..2d40ca1 100644 (file)
--- a/mod/book/tool/print/print.css
+++ b/mod/book/tool/print/print.css
@@ -1,4 +1,4 @@
-
+/*csslint important:false */
 #page-mod-book-print {
     color: #000;
     background-color: #fff;