Remove duplicate function.

Fix reading QR codes with transparent backgrounds

src/core/lib/QRCode.mjs

@@ -33,6 +33,8 @@ export async function parseQrCode(input, normalise) {
             image.background(0xFFFFFFFF);
             image.normalize();
             image.greyscale();
+            image = await image.getBufferAsync(jimp.MIME_JPEG);
+            image = await jimp.read(image);
         }
     } catch (err) {
         throw new OperationError(`Error normalising iamge. (${err})`);