Fix: support obfuscated keys in release mode for displayFromJson

[Saad-Rajpoot]

What this does:

Fixes an issue where in release mode, the MethodChannel response contains obfuscated keys (a, b, c, d) instead of proper JSON keys like displayId, flags, etc.

Fix:

Updated displayFromJson() to safely fallback to obfuscated keys using null-aware operator:

Display displayFromJson(Map<String, dynamic> json) => Display(
  displayId: json['displayId'] ?? json['a'],
  flag: json['flags'] ?? json['b'],
  name: json['name'] ?? json['d'],
  rotation: json['rotation'] ?? json['c'],
);