[patch] reset ticker whenever a batch is processed

[bnkamalesh]

This may seem redundant, but improves the accuracy of the overall behaviour.

Without the reset, the following tick could be executed immediately after a batch is processed. It could happen on the following conditions:

1. The total time taken for processing the batch
2. When N number of batches are processed, triggered by BATCH_FULL, ticker would eventually tick with a small/empty batch. Despite the channel is continuously receiving items