fixes #4561 - added dijit_a11y .dijitTabChecked style to use a dashed border for active tab in high contrast mode.  Also had to add dijit_a11y .dijitTabInnerDiv to remove left solid border when in high contrast. 
fixes #4561 - added dijit_a11y .dijitTabChecked style to use a dashed border for active tab in high contrast mode.  Also had to add dijit_a11y .dijitTabInnerDiv to remove left solid border when in high contrast. 

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@10753 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful