ENYO-2997: put focus on Ace as returning from Deimos, restore CTRL+S file saving action

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-2997

Focus is given back to Ace when user go back to the editor from the editor button of the designer. CTRL+S command leads to the file saving action and no more to the Ares HTML file saving action of the browser.

Enyo-DCO-1.1-Signed-off-by: Vincent HERILIER vincent.herilier@hp.com