[wallet/desktop] fix: multisig graph sorting issue

[OlegMakarenko]

Problem

The AccountMultisigGraph dataset getter causes a side effect by mutating multisigAccountGraphInfo from Account state.

Solution

Copy multisigAccountGraphInfo members to new array.

[codecov-commenter]

Codecov Report

Merging #1890 (23668e6) into dev (8334bb5) will increase coverage by 0.62%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1890      +/-   ##
==========================================
+ Coverage   25.58%   26.20%   +0.62%     
==========================================
  Files         591      591              
  Lines       14022    14068      +46     
  Branches     2372     2377       +5     
==========================================
+ Hits         3588     3687      +99     
+ Misses      10349    10297      -52     
+ Partials       85       84       -1     

Flag	Coverage Δ
wallet-desktop	26.20% <100.00%> (+0.62%)	⬆️

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Impacted Files	Coverage Δ
...ents/AccountMultisigGraph/AccountMultisigGraph.vue	100.00% <ø> (ø)
...accounts/AccountDetailsPage/AccountDetailsPage.vue	100.00% <ø> (+100.00%)	⬆️
...nts/AccountMultisigGraph/AccountMultisigGraphTs.ts	100.00% <100.00%> (ø)
src/store/Account.ts	11.11% <100.00%> (+5.83%)	⬆️
...ccounts/AccountDetailsPage/AccountDetailsPageTs.ts	33.66% <100.00%> (+33.66%)	⬆️
...ImportanceScoreDisplay/ImportanceScoreDisplayTs.ts	26.66% <0.00%> (+26.66%)	⬆️
.../ImportanceScoreDisplay/ImportanceScoreDisplay.vue	100.00% <0.00%> (+100.00%)	⬆️