fix(bridge-ui): issue with decimals

[jscriptcoder]

We're not making good use of decimals, assuming 18 decimals for all ERC20 tokens also

[codecov]

Codecov Report

Merging #13892 (e32b8e8) into main (23fb29d) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #13892      +/-   ##
==========================================
+ Coverage   51.47%   51.55%   +0.07%     
==========================================
  Files         143      144       +1     
  Lines        3792     3798       +6     
  Branches      332      333       +1     
==========================================
+ Hits         1952     1958       +6     
  Misses       1726     1726              
  Partials      114      114              

Flag	Coverage Δ		*Carryforward flag
bridge-ui	94.31% <100.00%> (+0.04%)	⬆️
eventindexer	77.28% <ø> (ø)		Carriedforward from 9fad628
protocol	0.00% <ø> (ø)		Carriedforward from 9fad628
relayer	59.57% <ø> (ø)		Carriedforward from 9fad628
ui	100.00% <ø> (ø)		Carriedforward from 9fad628

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
packages/bridge-ui/src/domain/bridge.ts	100.00% <ø> (ø)
packages/bridge-ui/src/bridge/ERC20Bridge.ts	80.64% <100.00%> (ø)
packages/bridge-ui/src/bridge/ETHBridge.ts	77.35% <100.00%> (ø)
...ges/bridge-ui/src/relayer-api/RelayerAPIService.ts	100.00% <100.00%> (ø)
packages/bridge-ui/src/storage/StorageService.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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