Do not use multicall while reading on chain data for individual beacon updates

[bdrhn9]

Related with #449.

Linked PR for #449 removes using multi call while sending transaction to update individual beacons. This saves gas overhead that multi call cause. However in the process of reading on chain data to check whether condition is satisfied, multi call is being utilizied even if one beacon is in the batch. This cost no extra money because it's static call but increases overhead on RPC side.