Fix connectionState test in cr_network_icon.js

connectionState is gauranteed to be defined in the mojo NetworkState
object.

Bug: 980659
Change-Id: I6d9022f2e3a6e5517b2748f920a694092a867da1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716101
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680254}

ui/webui/resources/cr_elements/chromeos/network/cr_network_icon.js

@@ -88,8 +88,7 @@ Polymer({
     }
 
     if (!this.isListItem &&
-        (!connectionState ||
-         connectionState == mojom.ConnectionStateType.kNotConnected)) {
+        connectionState == mojom.ConnectionStateType.kNotConnected) {
       return prefix + 'not-connected';
     }