BugFix: Move TestingSetup::ECCVerifyHandle member to BasicTestingSetup.
BugFix: Move TestingSetup::ECCVerifyHandle member to BasicTestingSetup.

As the libsecp256k1 context was only initialized in the TestingSetup, we have been forced to use it when sometimes it is not necessary (TestingSetup is a complete setup that includes CConnman, scheduler, validation interface, etc).

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