Remove dodgy MS AppCenter NSUserDefaults keys

dodgy_ms_appcenter_keys.mm

NSUserDefaults* def = [NSUserDefaults standardUserDefaults];

for(NSString* key in @[@"pastDevicesKey", @"SessionIdHistory", @"UserIdHistory"])
{
    id obj = [def objectForKey:key];
    
    // These must be NSData.
    if ([obj isKindOfClass:[NSString class]])
    {
        NSLog(@"Removed dodgy %@ key from NSUSerDefaults", key);
        [def removeObjectForKey: key];
        [def synchronize];
    }
}