Make protocol descriptors check if a URI is secure.

Fixes issue CLIENT-209

Change-Id: If8bd4e6af24ee32959bf006b02bdab115f42fee7
Depends-On: Ibf3e3a2f03270089849d9943a535e022245e0f44
Depends-On: I802cf467f0c4f41f6316ddba5451069b0bbaa0c5
Reviewed-on: http://gerrit.dmdirc.com/2000
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/Server.java

@@ -822,8 +822,8 @@ public class Server extends WritableFrameContainer
      */
     private void updateIcon() {
         final String icon = myState.getState() == ServerState.CONNECTED
-                    ? address.getScheme().endsWith("s") ? "secure-server" : "server"
-                    : "server-disconnected";
+                ? protocolDescription.isSecure(address)
+                ? "secure-server" : "server" : "server-disconnected";
         setIcon(icon);
     }