Remove unused tag in lazy pruning backend

[codecov-commenter]

Codecov Report

Patch coverage: 90.00% and project coverage change: -0.03 :warning:

Comparison is base (be44744) 90.64% compared to head (5bcafa4) 90.61%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #87 +/- ## ========================================== - Coverage 90.64% 90.61% -0.03% ========================================== Files 13 13 Lines 652 650 -2 ========================================== - Hits 591 589 -2 Misses 61 61 ``` | [Impacted Files](https://app.codecov.io/gh/gaurav-arya/StochasticAD.jl/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Gaurav+Arya) | Coverage Δ | | |---|---|---| | [src/stochastic\_triple.jl](https://app.codecov.io/gh/gaurav-arya/StochasticAD.jl/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Gaurav+Arya#diff-c3JjL3N0b2NoYXN0aWNfdHJpcGxlLmps) | `73.68% <ø> (ø)` | | | [src/backends/pruned.jl](https://app.codecov.io/gh/gaurav-arya/StochasticAD.jl/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Gaurav+Arya#diff-c3JjL2JhY2tlbmRzL3BydW5lZC5qbA==) | `91.04% <90.00%> (-0.26%)` | :arrow_down: |

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