fix: wrong chainid logic

[yqrashawn]

PORTAL-2867

---

This change is 

[AngeliaQ]

Task linked: PORTAL-2867 [automation]espace在fluent测试网环境下提示切换成测试网

[codecov]

Codecov Report

Merging #881 (3a04df6) into dev (97f4f88) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##              dev     #881   +/-   ##
=======================================
  Coverage   40.17%   40.17%           
=======================================
  Files         560      560           
  Lines       32799    32799           
  Branches     1884     1884           
=======================================
  Hits        13176    13176           
  Misses      19439    19439           
  Partials      184      184           

Flag	Coverage Δ
integrationtests	31.76% <0.00%> (ø)
unittests	27.38% <0.00%> (ø)

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

Impacted Files	Coverage Δ
packages/rpcs/cfx_chainId/index.js	90.90% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 97f4f88...3a04df6. Read the comment docs.