NetDB: Wake up FloodfillMonitor when ff setting changes,

so it will take effect immediately, and log in event log.
Don't queue multiple FloodJobs after changes

apps/routerconsole/java/src/net/i2p/router/web/helpers/ConfigAdvancedHandler.java

@@ -109,9 +109,8 @@ public class ConfigAdvancedHandler extends FormHandler {
             FloodfillNetworkDatabaseFacade fndf = (FloodfillNetworkDatabaseFacade) _context.netDb();
             boolean wasFF = fndf.floodfillEnabled();
             boolean isFF = _ff.equals("true");
+            // this will rebuild the RI, log in the event log, etc.
             fndf.setFloodfillEnabled(isFF);
-            if (wasFF != isFF)
-                _context.router().rebuildRouterInfo();
         }
         if (saved) 
             addFormNotice(_t("Configuration saved successfully"));