fix(frontend): use correct readonly prop on Fish action form

[lwih]

On utilisait la mauvaise prop pour passer un form element en readonly

[github-actions]

Coverage Report for frontend

Status	Category	Percentage	Covered / Total
🟢	Lines	77.8% (🎯 50%)	1809 / 2325
🟢	Statements	77.69% (🎯 50%)	1877 / 2416
🟢	Functions	75.08% (🎯 50%)	467 / 622
🟢	Branches	69% (🎯 50%)	766 / 1110

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
frontend/src/features/pam/mission/components/elements/actions/fish/fish-control-administrative-section.tsx	100%	90%	20%	100%
frontend/src/features/pam/mission/components/elements/actions/fish/fish-control-engines-section.tsx	66.66%	0%	33.33%	66.66%	20-78

Generated in workflow #991