[FIX] web(_diagram): set viewType on views

The attibute was correctly set on form, list and kanban views, but
not on the other ones. It wasn't really used until now, so it
wasn't a big deal.

addons/web/static/src/js/views/abstract_view.js

@@ -40,12 +40,12 @@ var AbstractView = Class.extend({
     // multi_record is used to distinguish views displaying a single record
     // (e.g. FormView) from those that display several records (e.g. ListView)
     multi_record: true,
-
     // determine if a search view should be displayed in the control panel and
     // allowed to interact with the view.  Currently, the only not searchable
     // views are the form view and the diagram view.
     searchable: true,
-
+    // viewType is the type of the view, like 'form', 'kanban', 'list'...
+    viewType: undefined,
     config: {
         Model: AbstractModel,
         Renderer: AbstractRenderer,

addons/web/static/src/js/views/calendar/calendar_view.js

@@ -28,6 +28,7 @@ var CalendarView = AbstractView.extend({
         Controller: CalendarController,
         Renderer: CalendarRenderer,
     },
+    viewType: 'calendar',
     init: function (viewInfo, params) {
         this._super.apply(this, arguments);
         var arch = viewInfo.arch;

addons/web/static/src/js/views/graph/graph_view.js

@@ -32,6 +32,7 @@ var GraphView = AbstractView.extend({
         Controller: Controller,
         Renderer: GraphRenderer,
     },
+    viewType: 'graph',
     /**
      * @override
      */

addons/web/static/src/js/views/pivot/pivot_view.js

@@ -27,6 +27,7 @@ var PivotView = AbstractView.extend({
         Controller: PivotController,
         Renderer: PivotRenderer,
     },
+    viewType: 'pivot',
     /**
      * @override
      * @param {Object} params

addons/web_diagram/static/src/js/diagram_view.js

@@ -26,6 +26,7 @@ var DiagramView = BasicView.extend({
         Renderer: DiagramRenderer,
         Controller: DiagramController,
     },
+    viewType: 'diagram',
 
     /**
      * @override