dagstore/InitializeAll: Fix throttling bug for concurrency=0

[aarshkshah1992]

Address #7169 (comment).

[codecov]

Codecov Report

Merging #7177 (928ac21) into master (87fc8db) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7177      +/-   ##
==========================================
- Coverage   34.85%   34.82%   -0.03%     
==========================================
  Files         685      685              
  Lines       80187    80188       +1     
==========================================
- Hits        27947    27927      -20     
- Misses      46553    46566      +13     
- Partials     5687     5695       +8     

Impacted Files	Coverage Δ
node/impl/storminer.go	22.46% <0.00%> (-0.05%)	⬇️
journal/types.go	86.66% <0.00%> (-13.34%)	⬇️
extern/sector-storage/manager_calltracker.go	57.70% <0.00%> (-4.85%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
node/hello/hello.go	63.21% <0.00%> (-3.45%)	⬇️
journal/fs.go	68.25% <0.00%> (-3.18%)	⬇️
extern/storage-sealing/fsm.go	55.42% <0.00%> (-1.21%)	⬇️
chain/store/store.go	63.41% <0.00%> (-1.07%)	⬇️
chain/stmgr/execute.go	74.09% <0.00%> (-1.04%)	⬇️
chain/sync_manager.go	66.77% <0.00%> (-0.63%)	⬇️
... and 11 more

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[raulk]

This is better. We need tests for these operations! #7138