Bug 1313363 - NotificationClient: Use BigTextStyle instead of InboxStyle. r=Grisha

There's no reason to use InboxStyle here. We do not add any items to the list.
Currently the content text is truncated aggressively showing only one line of
text. With BigTextStyle we can show a lot more.

MozReview-Commit-ID: 8CQZVHzc7b8

--HG--
extra : rebase_source : c717e0c532d7ee101fac89e12db7961e44e811f7

mobile/android/base/java/org/mozilla/gecko/notifications/NotificationClient.java

@@ -147,9 +147,9 @@ public final class NotificationClient implements NotificationListener {
                 .setContentIntent(contentIntent)
                 .setDeleteIntent(deleteIntent)
                 .setAutoCancel(true)
-                .setStyle(new NotificationCompat.InboxStyle()
+                .setStyle(new NotificationCompat.BigTextStyle()
-                          .addLine(alertText)
+                        .bigText(alertText)
-                          .setSummaryText(host));
+                        .setSummaryText(host));
 
         // Fetch icon.
         if (!imageUrl.isEmpty()) {