Fix: Update the prefix of forex

[LeifuChen]

Description

Updated the prefix of GBP, EUR and AUD to FX instead of Crypto

Related issue

#2680
#2683

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

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[avclarke]

one minor other bit of clean up we could do

[codecov]

Codecov Report

Merging #2687 (f30f13c) into dev (3397a7d) will decrease coverage by 0.01%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##              dev    #2687      +/-   ##
==========================================
- Coverage   51.26%   51.26%   -0.01%     
==========================================
  Files         382      382              
  Lines       11542    11544       +2     
  Branches     2758     2759       +1     
==========================================
+ Hits         5917     5918       +1     
- Misses       5402     5403       +1     
  Partials      223      223              

Files Changed	Coverage Δ
...ages/app/src/queries/rates/useCandlesticksQuery.ts	28.57% <25.00%> (-1.06%)	⬇️
packages/app/src/queries/rates/constants.ts	66.66% <100.00%> (+6.66%)	⬆️

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