remove trailing '/' from etherscan link

[gerrrg]

remove trailing '/' from etherscan link to eliminate double '//' when tx/address links are generated

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any new dependencies that are required for this change.

Fixes # (issue)

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Other

How should this be tested?

Please provide instructions so we can test. Please also list any relevant details for your test configuration.

• [ ] Test A
• [ ] Test B

Checklist:

• [ ] I have performed a self-review of my own code
• [ ] I have commented my code where relevant, particularly in hard-to-understand areas
• [ ] My changes generate no new console warnings
• [ ] The base of this PR is master if hotfix, develop if not

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