move the dispatch queue switch for the start completion block for readability

@@ -232,7 +232,6 @@ public class MobileScanner: NSObject, AVCaptureVideoDataOutputSampleBufferDelega
                     device.activeFormat.formatDescription)
                 let hasTorch = device.hasTorch
                 
-                DispatchQueue.main.async {
                 completion(
                     MobileScannerStartParameters(
                         width: Double(dimensions.height),
@@ -241,16 +240,13 @@ public class MobileScanner: NSObject, AVCaptureVideoDataOutputSampleBufferDelega
                         textureId: self.textureId ?? 0
                     )
                 )
-                }
                 
                 return
             }
             
-            DispatchQueue.main.async {
             completion(MobileScannerStartParameters())
         }
     }
-    }
 
     /// Stop scanning for barcodes
     func stop() throws {

@@ -121,7 +121,12 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin {
 
         do {
             try mobileScanner.start(barcodeScannerOptions: barcodeOptions, returnImage: returnImage, cameraPosition: position, torch: torch ? .on : .off, detectionSpeed: detectionSpeed) { parameters in
-                result(["textureId": parameters.textureId, "size": ["width": parameters.width, "height": parameters.height], "torchable": parameters.hasTorch])
+                DispatchQueue.main.async {
+                    result([
+                        "textureId": parameters.textureId,
+                        "size": ["width": parameters.width, "height": parameters.height],
+                        "torchable": parameters.hasTorch])
+                }
             }
         } catch MobileScannerError.alreadyStarted {
             result(FlutterError(code: "MobileScanner",