Fix/Add Missing WEB_VIEW display capabilities

[ShobhitAd]

Fixes #686

This PR is ready for review.

Testing Plan

1. Start policy server
2. Add the following entry in sdl_preloaded_pt.json

            "45b2c12c-a289-4c08-b4e4-bee768bf0cf9": {
                "AppHMIType": [ "WEB_VIEW" ],
                "keep_context": false,
                "steal_focus": false,
                "priority": "NONE",
                "default_hmi": "NONE",
                "groups": ["Base-4", "WidgetSupport"],
                "hybrid_app_preference": "CLOUD",
                "enabled": false,
                "transport_type ": "WS"
            },

3. Change the appStoreUrl in Flags.js to http://localhost:3000/api/v1/applications/store
4. Start core and HMI
5. In the HMI, enable the "Hello Webengine3" app in the app store and activate the app
6. In the WEB_VIEW change the display layout to NON-MEDIA
7. Click on Options -> Return to WEB_VIEW

CLA

• I have signed the CLA

[jacobkeeler]

Approving, though I will note two unrelated issues I found during testing

1. It seems ONSCREEN_PRESETS is missing from the template list of several of the templates.
2. Using the flow you gave in the PR description, I get an error. If you try to switch to NON-MEDIA from WEB_VIEW and back, it seems several things go wrong with the HMI state at the moment.