Fix for loading state of Fast Refresh from user defaults (#29880)

Summary:
Disabling Fast Refresh won't be persisted when restarting the app.

I believe this regressed with 824e171. In this commit `HMRClient.setup` will always be called with `enabled` being set true. This PR loads the _enabled_ state from the user defaults (as it was done before).

## Changelog

[iOS] [Fixed] - Enable Fast Refresh gets persisted across app launches

Pull Request resolved: #29880

Test Plan:
Without this change Fast Refresh is enabled on every app restart.

Tested with this change:
- Disabling Fast Refresh
- Restarting App -> Fast Refresh still disabled
- Enabled Fast Refresh again
- Restarting App -> Fast Refresh still enabled again

Reviewed By: sammy-SC

Differential Revision: D23686435

Pulled By: PeteTheHeat

fbshipit-source-id: 42c31b22060d3dc4b1d4cb8f41792b303fc7fce8

React/CoreModules/RCTDevSettings.mm

@@ -405,17 +405,18 @@ - (void)addHandler:(id<RCTPackagerClientMethod>)handler forPackagerMethod:(NSStr
 
 - (void)setupHMRClientWithBundleURL:(NSURL *)bundleURL
 {
- if (bundleURL && !bundleURL.fileURL) { // isHotLoadingAvailable check
+ if (bundleURL && !bundleURL.fileURL) {
  NSString *const path = [bundleURL.path substringFromIndex:1]; // Strip initial slash.
  NSString *const host = bundleURL.host;
  NSNumber *const port = bundleURL.port;
+ BOOL isHotLoadingEnabled = self.isHotLoadingEnabled;
  if (self.bridge) {
  [self.bridge enqueueJSCall:@"HMRClient"
  method:@"setup"
- args:@[ @"ios", path, host, RCTNullIfNil(port), @(YES) ]
+ args:@[ @"ios", path, host, RCTNullIfNil(port), @(isHotLoadingEnabled) ]
  completion:NULL];
  } else {
- self.invokeJS(@"HMRClient", @"setup", @[ @"ios", path, host, RCTNullIfNil(port), @(YES) ]);
+ self.invokeJS(@"HMRClient", @"setup", @[ @"ios", path, host, RCTNullIfNil(port), @(isHotLoadingEnabled) ]);
  }
  }
 }