Fix image wrong scale factor when load image from file system (facebook#23446)

Summary:
Regression, fix image load from `~/Library` not respect scale factor.
Fixes facebook#22383 , the bug comes from [Clean up some URL path handling](facebook@998197f).

[iOS] [Fixed] - Fix image wrong scale factor when load image from file system
Pull Request resolved: facebook#23446

Differential Revision: D14099614

Pulled By: cpojer

fbshipit-source-id: eb2267b195a05eb70cdc4671536a4c1d47fb03e2

Author: zhongwuzw

React/Base/RCTUtils.m

@@ -708,13 +708,11 @@ BOOL RCTIsLocalAssetURL(NSURL *__nullable imageURL)
 
   if (!image) {
     // Attempt to load from the file system
-    NSData *fileData;
-    if (imageURL.pathExtension.length == 0) {
-      fileData = [NSData dataWithContentsOfURL:[imageURL URLByAppendingPathExtension:@"png"]];
-    } else {
-      fileData = [NSData dataWithContentsOfURL:imageURL];
+    NSString *filePath = [NSString stringWithUTF8String:[imageURL fileSystemRepresentation]];
+    if (filePath.pathExtension.length == 0) {
+      filePath = [filePath stringByAppendingPathExtension:@"png"];
     }
-    image = [UIImage imageWithData:fileData];
+    image = [UIImage imageWithContentsOfFile:filePath];
   }
 
   if (!image && !bundle) {