Show serial number for all ADB devices

Previously devices usually only had their ADB produce name. It's
possible to have multiple devices with same name connected. Showing
serial number allows differentiating between the similar devices.

Test: Run cherry, visual inspection
Change-Id: Ib460cc0b77e2bce34657a68bfc0ccfa9ca5151de
diff --git a/client/partials/testLaunch.html b/client/partials/testLaunch.html
index ab2902c..3335b20 100644
--- a/client/partials/testLaunch.html
+++ b/client/partials/testLaunch.html
@@ -182,7 +182,7 @@
 			<div ng-controller="DeviceConfigCtrl" ng-repeat="connection in adbDeviceConnections.connections" ng-class="{active:selectedDeviceId===connection.deviceId}" class="panel panel-default" ng-init="initADB(connection)">
 				<div class="panel-heading clickable" ng-click="selectDevice(connection.deviceId)" ng-dblclick="isOpen = !isOpen">
 					<h4 class="panel-title">
-						<b>{{ value.name || 'Unknown device (' + value.adbSerialNumber + ')' }}</b>
+						<b>{{ value.name || 'Unknown device' }}</b> ({{ value.adbSerialNumber || '' }})
 						- <span ng-class="connection.state | adbDeviceStateClass">{{ connection.state | adbDeviceStateHumanReadable }}</span>
 
 						<div id="expandButton" class="pull-right" ng-click="isOpen = !isOpen">