[AltServer] Fixes not ignoring InstallationError.cancelled when installing app

Allows InstallationError to be bridged back from NSError, which lets us match InstallationError against NSError's via pattern matching.

AltServer/Devices/ALTDeviceManager+Installation.swift

@@ -14,7 +14,7 @@ private let appGroupsLock = NSLock()
 
 private let developerDiskManager = DeveloperDiskManager()
 
-enum InstallError: LocalizedError
+enum InstallError: Int, LocalizedError, _ObjectiveCBridgeableError
 {
     case cancelled
     case noTeam
@@ -30,6 +30,20 @@ enum InstallError: LocalizedError
         case .missingCertificate: return "The developer certificate could not be found."
         }
     }
+    
+    init?(_bridgedNSError error: NSError)
+    {
+        guard error.domain == InstallError.cancelled._domain else { return nil }
+        
+        if let installError = InstallError(rawValue: error.code)
+        {
+            self = installError
+        }
+        else
+        {
+            return nil
+        }
+    }
 }
 
 extension ALTDeviceManager