refactor(@Detect): remove source field

Ambigious information. Previously required when `QrcodeDropZone`
and `QrcodeStream` where one component.

BREAKING CHANGE: `source` field removed from @Detect payload.

Author: gruhn

src/components/QrcodeCapture.vue

@@ -31,7 +31,7 @@ export default {
       const imageData = await imageDataFromFile(file);
       const scanResult = await scan(imageData);
 
-      return { source: "file", ...scanResult };
+      return scanResult;
     }
   }
 };

src/components/QrcodeDropZone.vue

@@ -41,14 +41,14 @@ export default {
       const imageData = await imageDataFromFile(file);
       const scanResult = await scan(imageData);
 
-      return { source: "file", ...scanResult };
+      return scanResult;
     },
 
     async processUrl(url) {
       const imageData = await imageDataFromUrl(url);
       const scanResult = await scan(imageData);
 
-      return { source: "url", ...scanResult };
+      return scanResult;
     },
 
     async processUrl(url) {

src/components/QrcodeStream.vue

@@ -187,7 +187,7 @@ export default {
 
     startScanning() {
       const detectHandler = result => {
-        this.onDetect(Promise.resolve({ source: "stream", ...result }));
+        this.onDetect(Promise.resolve(result));
       };
 
       // this.stopScanning()