Use same color for icon, arrow and project title on dash sidebar

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/dashboard.scss

@@ -76,7 +76,6 @@
     float: right;
     margin: 0;
     font-size: 20px;
-    color: #666;
   }
 
   .last-activity {
@@ -110,6 +109,5 @@
 .dash-project-access-icon {
   float: left;
   margin-right: 3px;
-  color: #999;
   width: 16px;
 }