isConnected was always false in React Native ≥0.80

[rajarajan-dev]

react-native-offline relies on this.status inside XMLHttpRequest event handlers

xhr.onload = function onLoad() {
  if (this.status >= 200 && this.status < 400) {
    resolve({ status: this.status });
  } else {
    reject({ status: this.status });
  }
};

this code worked early, because this inside the callback was bound to the xhr instance.
However, in React Native 0.80+ this is no longer bound to xhr. As a result, this.status is always 0 or undefined.
This causes checkInternetAccess and makeHttpRequest to incorrectly report no internet connection, even when a valid response is received (status: 200).

Steps to Reproduce:

• Upgrade to React Native 0.80 (or above).
• Use ReduxNetworkProvider or NetworkProvider.
• Call useIsConnected() — it always returns false, even with internet.
• Logs show
  [makeHttpRequest file ] onload fired, status = 200 but
  [NetworkConnectivity file ] setState isConnected = false.

Expected Behavior:
isConnected should return true when a valid HTTP status code (2xx/3xx) is received.

Actual Behavior:
isConnected is always false because this.status evaluates to 0|undefined.

Proposed Fix:
Replace this.status with explicit xhr.status in makeHttpRequest.ts

xhr.onload = function onLoad() {
  if (xhr.status >= 200 && xhr.status < 400) {
    resolve({ status: xhr.status });
  } else {
    reject({ status: xhr.status });
  }
};