fix: fix linea ticker

[salimtb]

Description

Linea mainnet ticker should not be undefined.

Related issues

Fixes:

Manual testing steps

1. Go to network selector and choose lieann
2. Go back to the wallet page
3. scam warning is displayed for Linea mainnet because ticker is undefined

Screenshots/Recordings

Before

After

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[salimtb]

the value of TEST_NETWORK_TICKER_MAP[NETWORK_TYPES.LINEA_MAINNET] is undefined instead of ETH

[sahar-fehri]

Emmmm i see the selector name is getNonTestNetworks, so it makes sense that the ticker is not from TEST_NETWORK_TICKER_MAP. also linea mainnet is explicitly excluded from TEST_NETWORK_TICKER_MAP;
Doing this LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.93%. Comparing base (523af49) to head (351de2e).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #25436   +/-   ##
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  Coverage    64.93%   64.93%           
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  Files         1385     1385           
  Lines        54870    54870           
  Branches     14408    14408           
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  Hits         35625    35625           
  Misses       19245    19245           

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Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
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