Fuse 1.9 fix

Baggers: Seems like uno might have previously allowed implicit casts from int to ulong (which is likely illegal according to the c# spec) so I guess that got fixed.

Author: LuisRodriguezLD

src/Android/AndroidImpl.uno

@@ -90,31 +90,31 @@ namespace Fuse.BackgroundDownload
         {
             var handler = OnPaused;
             if (handler != null)
-                handler(taskIdentifier);
+                handler((ulong)taskIdentifier);
         }
 
         [ForeignFixedName]
         static void RecieveProgress(int taskIdentifier, int totalBytesWritten, int totalBytesExpectedToWrite)
         {
             var handler = OnProgress;
             if (handler != null)
-                handler(taskIdentifier, totalBytesWritten, totalBytesExpectedToWrite);
+                handler((ulong)taskIdentifier, (ulong)totalBytesWritten, (ulong)totalBytesExpectedToWrite);
         }
 
         [ForeignFixedName]
         static void RecieveSuccessfulCompletion(int taskIdentifier, string finalPath)
         {
             var handler = OnSucceeded;
             if (handler != null)
-                handler(taskIdentifier, finalPath);
+                handler((ulong)taskIdentifier, finalPath);
         }
 
         [ForeignFixedName]
         static void RecieveErroredCompletion(int taskIdentifier, string errorMessage)
         {
             var handler = OnFailed;
             if (handler != null)
-                handler(taskIdentifier, errorMessage);
+                handler((ulong)taskIdentifier, errorMessage);
         }
     }
 }

src/iOS/iOSImpl.uno

@@ -89,7 +89,7 @@ namespace Fuse.BackgroundDownload
                 if (totalBytesExpectedToWrite== UNKNOWN_SIZE)
                     handler(taskIdentifier, totalBytesWritten, totalBytesExpectedToWrite);
                 else
-                    handler(taskIdentifier, -1, -1);
+                    handler(taskIdentifier, (ulong)-1, (ulong)-1);
             }
         }