Remove the IsFirst columns in all components used in Blake example #1067
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Currently, the Blake example can run with LOG_N_INSTANCES=6 but not other parameters, because the Scheduler, Round, and XOR table components may want to use IsFirst columns of the same size, but the framework prevents duplicated preprocessed columns, which consistently happens when LOG_N_INSTANCES is larger than 6.
This PR changes the existing example to reflect the recent changes to logUp sum by removing the use of IsFirst columns altogether across all components. Note that such removal is safe since these columns have already been "unused" by the proof system.