build(cellnav): fix cellnav.less path

Author: marcelo-portugal

lib/less/main.less

@@ -1,5 +1,5 @@
 @import '../../packages/core/less/main.less';
-@import '../../packages/cellnav/less/cellnav.less';
+@import '../../packages/cellnav/less/cellNav.less';
 @import '../../packages/edit/less/edit.less';
 @import '../../packages/empty-base-layer/less/emptyBaseLayer.less';
 @import '../../packages/expandable/less/expandable.less';