alexa: set screen ratio to 720p (#625)

plugins/alexa/package.json

@@ -1,6 +1,6 @@
 {
    "name": "@scrypted/alexa",
-   "version": "0.2.0",
+   "version": "0.2.1",
    "scripts": {
       "scrypted-setup-project": "scrypted-setup-project",
       "prescrypted-setup-project": "scrypted-package-json",

plugins/alexa/src/types/camera/handlers.ts

@@ -17,6 +17,12 @@ export class AlexaSignalingSession implements RTCSignalingSession {
                 sdp: this.directive.payload.offer.value,
             },
             disableTrickle: true,
+            // this could be a low resolutions creen, no way of knowning, so never send a 1080p stream
+            screen: {
+                devicePixelRatio: 1,
+                width: 1280,
+                height: 720
+            }
         }
     }