ONOS-4359: continued work on theming UI
- replaced masthead logo with double-resolution image.

Change-Id: Ia6ac1a1c1a2870487b60e28ea9c89b69cdfbd979
(cherry picked from commit 9f4303b)
diff --git a/web/gui/src/main/webapp/app/fw/mast/mast.css b/web/gui/src/main/webapp/app/fw/mast/mast.css
index ef982bb..4b8131e 100644
--- a/web/gui/src/main/webapp/app/fw/mast/mast.css
+++ b/web/gui/src/main/webapp/app/fw/mast/mast.css
@@ -39,7 +39,7 @@
 
 #mast img.logo {
     height: 47px;
-    width: 436px;
+    width: 511px;
     margin: 0;
 }
 
diff --git a/web/gui/src/main/webapp/data/img/masthead-logo-mojo.png b/web/gui/src/main/webapp/data/img/masthead-logo-mojo.png
index 389b873..46cc874 100644
--- a/web/gui/src/main/webapp/data/img/masthead-logo-mojo.png
+++ b/web/gui/src/main/webapp/data/img/masthead-logo-mojo.png
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