fork block config fix

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #772 into master will increase coverage by 0.00%.
The diff coverage is 58.82%.

@@           Coverage Diff            @@
##           master     #772    +/-   ##
========================================
  Coverage   50.47%   50.47%            
========================================
  Files         410      413     +3     
  Lines       53461    53656   +195     
========================================
+ Hits        26983    27083   +100     
- Misses      24418    24496    +78     
- Partials     2060     2077    +17     

Impacted Files	Coverage Δ
params/config.go	36.30% <12.50%> (ø)
rlp/raw.go	95.14% <100.00%> (ø)
p2p/discover/table.go	84.19% <0.00%> (-2.44%)	⬇️
whisper/whisperv6/whisper.go	54.00% <0.00%> (-1.22%)	⬇️
rpc/handler.go	89.76% <0.00%> (-0.94%)	⬇️
p2p/rlpx.go	69.40% <0.00%> (-0.57%)	⬇️
p2p/simulations/http.go	69.56% <0.00%> (-0.55%)	⬇️
ctxc/downloader/downloader.go	78.26% <0.00%> (-0.11%)	⬇️
p2p/peer.go	78.99% <0.00%> (ø)
params/version.go	33.33% <0.00%> (ø)
... and 12 more