[Plot] Add a key to view definition

Add a value for key to the definition of Plot view;
this avoids defaulting to Plot as a view for all
objects, WTD-628.

platform/features/plot/bundle.json

@@ -4,6 +4,7 @@
         "views": [
             {
                 "name": "Plot",
+                "key": "plot",
                 "templateUrl": "templates/plot.html",
                 "needs": [ "telemetry" ],
                 "delegation": true