Remove unused cfg attributes

[siddheshzz]

What is this PR for?

This PR fixes issue #358 part 1 - remove unused cfg "cli-blockchain"

What is the purpose of this pull request?

• Bug fix;
• New feature;
• Docs update;
• Test;
• Other: Code Quality.

Which aspect of floresta its being addresed?

• Blockchain;
• Nodes communication;
• User consumption;
• Utreexo accumulator;
• Other: Code Quality.

Checklists

• I've signed all my commits;
• I ran just lint;
• I ran cargo test;
• I checked the integration tests;
• I'm linking the issue being fixed by this PR (if any).

Description

This PR is Fixing clippy warning part 1 - By removing the #[cfg] Clippy warnings about unused features related to the cli-blockchain

[Davidson-Souza]

ACK 62dcc18