fix(celestia): use fixed delay in repeat attempts

[danwt]

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Close #752

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[srene]

IMO, its better to keep the backoff function, since there is a min and max delay. In case both values are the same, the delay will be fixed and will not increase over time. What i think we need is to be able to set those values in the config file, so nodes can choose the behavior, fixed or increasing delay, in case problems with batch submissions.

[danwt]

ok I will add another pr to expose config

[danwt]

you can still merge this?

[danwt]

see #757 for exposing config