save the config data correctly

sshshare/__main__.py

@@ -262,9 +262,9 @@ def main():
         configdata['img'] = 'sftp_img.img'
         configdata['secretserver']='https://cw-vm-d034.sa.nectar.org.au/sshshare/share/'
         configdata['proxyserver']='https://cw-vm-d034.sa.nectar.org.au/download/retrieve'
+        config.update(configdata)
         with open(configpath,'w') as f:
             f.write(yaml.dump(config))
-    config.update(configdata)
 
     parser = argparse.ArgumentParser()
     subparser = parser.add_subparsers()