Can't add action with integer_enum parameter

[ZdenekM]

The default value is '"0"', but it should be '0'.

fit-demo-arserver               | 2022-05-05 14:02:11 DEBUG    RPC request: AddAction.Request(id=44, request='AddAction', args=AddAction.Request.Args(action_point_id='acp_3b00b605941a4c1fad9b579683ccc965', name='test', type='obj_794a5eb6e89147e599b94f60d5dafb8a/test', parameters=[ActionParameter(name='param', type='integer_enum', value='"0"')], flows=[Flow(type=<FlowTypes.DEFAULT: 'default'>, outputs=[])]), dry_run=False), result: AddAction.Response(id=44, response='AddAction', result=False, messages=['Parameter param of action test has invalid value. Parameter param of action test has invalid value.'])

[ZdenekM]

...once working on this, it might be good to also take a look on robofit/arcor2#740 in order to improve the usability of integer enums.