feat: update demo landing page

feat: update demo landing page

Author: Felix-Dynamsoft

dist/dds.bundle.esm.d.ts

@@ -144,6 +144,7 @@ declare class DocumentScannerView {
     toggleSmartCapture(mode?: boolean): Promise<void>;
     toggleAutoCrop(mode?: boolean): Promise<void>;
     private get _demo_IsFirefoxAndroid();
+    private _demo_saveSelectedCamera;
     openCamera(_demo_cameraType?: _DEMO_CameraType): Promise<void>;
     closeCamera(hideContainer?: boolean): void;
     pauseCamera(): void;

dist/dds.bundle.js

@@ -150,6 +150,7 @@ declare class DocumentScannerView {
     toggleSmartCapture(mode?: boolean): Promise<void>;
     toggleAutoCrop(mode?: boolean): Promise<void>;
     private get _demo_IsFirefoxAndroid();
+    private _demo_saveSelectedCamera;
     openCamera(_demo_cameraType?: _DEMO_CameraType): Promise<void>;
     closeCamera(hideContainer?: boolean): void;
     pauseCamera(): void;