Fix failed test in getChainTips RPC

[jingyi2811]

What kind of PR is this?:

/kind fix

What this PR does / why we need it:

Fix fail test in getChainTips RPC which happens occasionally.

Which issue(s) does this PR fixes?:

Fixes #326

Additional comments?:

[codeclimate]

Code Climate has analyzed commit df89947 and detected 0 issues on this pull request.

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
packages/jellyfish/dist/jellyfish.umd.js	19.6 KB (0%)	393 ms (0%)	179 ms (+2.8% 🔺)	571 ms

[codecov]

Codecov Report

Merging #327 (df89947) into main (6554eff) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #327      +/-   ##
==========================================
+ Coverage   97.05%   97.09%   +0.03%     
==========================================
  Files          91       91              
  Lines        2514     2545      +31     
  Branches      319      323       +4     
==========================================
+ Hits         2440     2471      +31     
  Misses         74       74              

Impacted Files	Coverage Δ
...ellyfish-transaction/src/buffer/buffer_composer.ts	99.48% <100.00%> (+0.01%)	⬆️
...ages/jellyfish-transaction/src/script/defi/dftx.ts	97.36% <100.00%> (+0.07%)	⬆️
...jellyfish-transaction/src/script/defi/dftx_pool.ts	100.00% <100.00%> (ø)
...ckages/jellyfish-transaction/src/script/mapping.ts	96.59% <100.00%> (+0.07%)	⬆️

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[jingyi2811]

The test passed in the local environment.
However, it fails in GitHub occasionally.
To ensure the new code is working, I rerun the test four times and all passed.

[jingyi2811]

I merge this branch to #323 (The branch that Suraj faced this failed test)
and run the test 4 times. All passed.

Reverted back the code after testing