Remove deprecated shadow properties

src/components/scene-shadow.js

 // For use in environment gltf bundles to set scene shadow properties.
 AFRAME.registerComponent("scene-shadow", {
   schema: {
-    autoUpdate: {
-      type: "boolean",
-      default: true
-    },
     type: {
       type: "string",
       default: "pcf"
-    },
-    renderReverseSided: {
-      type: "boolean",
-      default: true
-    },
-    renderSingleSided: {
-      type: "boolean",
-      default: true
     }
   },
   init() {