modified height calcuration

lib/views/layout-growi/base/layout.html

@@ -33,7 +33,7 @@
 
 function DrawScrollbar() {
 
-  var h = window.innerHeight - ((document.getElementById('revision-toc').clientHeight))/2 ;
+  var h = window.innerHeight - (document.getElementById('revision-toc').clientHeight) ;
   $('#revision-toc-content').slimScroll({
     railVisible: true,
     height: h,