[#240] Increase hardcoded gas limit during transaction simulation

Description

Problem: Morley.Client.Action.Origination simulates an operation using which hardcoded gas limit 800k. That's outdated, currently the limit is 1040000 (in carthage).

Solution: as a hotfix we increase it to 1040000. Later we should make it resistant to protocol changes.

Related issue(s)

Resolves partially #420 (closed)

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