GUAC-932: Remove round borders on progress bar.

guacamole/src/main/webapp/app/notification/styles/notification.css

@@ -96,10 +96,6 @@
     padding: 0.25em;
     
     border: 1px solid gray;
-    -moz-border-radius: 0.2em;
-    -webkit-border-radius: 0.2em;
-    -khtml-border-radius: 0.2em;
-    border-radius: 0.2em;
 
     position: relative;