[bug] cannot set mode with UI when both max_pending and max_hourly_rate are 0

[feelancer21]

I cannot set mode with the UI when both max_pending and max_hourly_rate are 0. In this case the button is inactive and mode is set to 0. But it is possible to set the mode when one attribute is not 0.

When I set the limit directly with an own grpc client there is different behaviour. Then it is possible to set a mode different to 0 when both max-values are 0.