[Fix] correctly handle eachsite for Multiline objects

[lkdvos]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/algorithms/approximate/vomps.jl	94.54% <100.00%> (-0.20%)	⬇️
src/algorithms/groundstate/vumps.jl	85.71% <100.00%> (-0.21%)	⬇️
src/algorithms/statmech/vomps.jl	82.81% <100.00%> (-3.35%)	⬇️
src/states/abstractmps.jl	60.31% <100.00%> (+0.64%)	⬆️
src/utility/multiline.jl	65.38% <100.00%> (+0.67%)	⬆️

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