fix: Change the structure of builder

src/facedet/retinaface/mnn.rs

@@ -56,9 +56,10 @@ impl FaceDetectionBuilder {
 }
 
 impl FaceDetection {
-    pub fn builder<T: AsRef<[u8]>>()
-    -> fn(T) -> std::result::Result<FaceDetectionBuilder, Report<Error>> {
-        FaceDetectionBuilder::new
+    pub fn builder<T: AsRef<[u8]>>(
+        model: T,
+    ) -> std::result::Result<FaceDetectionBuilder, error_stack::Report<crate::errors::Error>> {
+        FaceDetectionBuilder::new(model)
     }
 
     pub fn new(path: impl AsRef<Path>) -> Result<Self> {