Use correct height to determine `node_id`

[hewison-chris]

When the Nominator is constructed it should take into account the ledger parameter in the constructor.

[codecov[bot]]

Codecov Report

Merging #3236 (d72af73) into v0.x.x (c9fd7de) will decrease coverage by 33.62%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           v0.x.x    #3236       +/-   ##
===========================================
- Coverage   87.37%   53.75%   -33.63%     
===========================================
  Files         165      330      +165     
  Lines       16956    35778    +18822     
===========================================
+ Hits        14816    19233     +4417     
- Misses       2140    16545    +14405     

Flag	Coverage Δ
integration	27.60% <100.00%> (?)
unittests	87.38% <100.00%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
source/agora/consensus/protocol/Nominator.d	91.13% <100.00%> (-0.55%)	:arrow_down:
...ra/submodules/vibe-core/source/vibe/core/channel.d	0.00% <0.00%> (ø)
agora/submodules/vibe.d/http/vibe/http/client.d	0.24% <0.00%> (ø)
agora/submodules/vibe.d/data/vibe/data/json.d	5.78% <0.00%> (ø)
...a/submodules/vibe-core/source/vibe/internal/list.d	67.24% <0.00%> (ø)
...gora/submodules/vibe.d/http/vibe/http/fileserver.d	0.00% <0.00%> (ø)
agora/submodules/barcode/source/barcode/code39.d	0.00% <0.00%> (ø)
...ra/submodules/vibe.d/utils/vibe/utils/validation.d	0.00% <0.00%> (ø)
agora/submodules/vibe.d/inet/vibe/inet/mimetypes.d	0.00% <0.00%> (ø)
... and 176 more

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