Fix foreign EC add soundness #3616

Job	Run time
Build-And-Test-Web	5m 41s
Build-And-Test-Server (Simple integration tests)	18m 10s
Build-And-Test-Server (DEX integration tests)	12m 47s
Build-And-Test-Server (DEX integration test with proofs)	12m 50s
Build-And-Test-Server (Voting integration tests)	5m 39s
Build-And-Test-Server (Unit tests)	40m 0s
Build-And-Test-Server (Verification Key Regression Check)	11m 22s
Build-And-Test-Server (CommonJS test)	2m 53s
Release-mina-signer-on-NPM	2m 14s
Release-on-NPM	2m 3s
	1h 53m 39s

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