timer: update double eager to use genesis

[DiogoSantoss]

Fix double eager timer by using genesis time instead of wall clock.

category: bug
ticket: #4241

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 38.09524% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.94%. Comparing base (fcb8c34) to head (76a5fb5).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
core/consensus/timer/roundtimer.go	36.36%	19 Missing and 2 partials ⚠️
core/consensus/qbft/qbft.go	42.85%	2 Missing and 2 partials ⚠️
app/app.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4243      +/-   ##
==========================================
- Coverage   57.03%   56.94%   -0.09%     
==========================================
  Files         237      237              
  Lines       30857    30892      +35     
==========================================
- Hits        17599    17592       -7     
- Misses      11021    11055      +34     
- Partials     2237     2245       +8     

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