Use Redactor in linebreaks mode

Linebreaks mode will result in <Enter> key adding a <br/> element to the
HTML markup rather than starting a new paragraph <p> element.

This patch also changes the behavior of the <Tab> key to change focus away
from the Redactor editor rather than indenting the current block.

js/redactor-osticket.js

@@ -134,7 +134,9 @@ $(function() {
                 'focus': false,
                 'plugins': ['fontcolor','fontfamily'],
                 'imageGetJson': 'ajax.php/draft/images/browse',
-                'syncBeforeCallback': captureImageSizes
+                'syncBeforeCallback': captureImageSizes,
+                'linebreaks': true,
+                'tabFocus': false
             };
         if (el.data('redactor')) return;
         if (el.hasClass('draft')) {