sealing: Fix retry loop in SubmitCommitAggregate

[magik6k]

Without this if something about the sector would be broken in a way which caused m.commiter.AddCommit to instantly error (e.g. sector expired), we'd blindly retry with no delay, causing tons of log spam and fsm io.

Fixes #7057

[codecov]

Codecov Report

Merging #7245 (41db98d) into master (6a02237) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7245      +/-   ##
==========================================
+ Coverage   39.09%   39.11%   +0.02%     
==========================================
  Files         610      610              
  Lines       64753    64751       -2     
==========================================
+ Hits        25315    25329      +14     
+ Misses      35043    35023      -20     
- Partials     4395     4399       +4     

Impacted Files	Coverage Δ
extern/storage-sealing/fsm.go	57.42% <ø> (+0.80%)	⬆️
extern/storage-sealing/states_sealing.go	38.04% <0.00%> (+0.16%)	⬆️
chain/actors/builtin/paych/paych.go	16.88% <0.00%> (-5.20%)	⬇️
extern/sector-storage/worker_tracked.go	90.14% <0.00%> (-4.23%)	⬇️
storage/wdpost_sched.go	75.24% <0.00%> (-3.97%)	⬇️
chain/stmgr/searchwait.go	62.09% <0.00%> (-2.62%)	⬇️
itests/kit/blockminer.go	93.65% <0.00%> (-1.59%)	⬇️
chain/stmgr/execute.go	74.09% <0.00%> (-1.04%)	⬇️
paychmgr/simple.go	79.93% <0.00%> (-0.93%)	⬇️
storage/wdpost_run.go	69.62% <0.00%> (-0.64%)	⬇️
... and 18 more

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[ZenGround0]

LGTM