Fix/cosmetic issues directional

[cardosofede]

Before submitting this PR, please make sure:

• Your code builds clean without any errors or warnings
• You are using approved title ("feat/", "fix/", "docs/", "refactor/")

A description of the changes proposed in the pull request:

• Remove duplicated signal value in format status of advanced directional strategy.
• Add more decimals to prices on format status for the position executor since was useless for some tokens.
• Add final status for closed executors.

Tests performed by the developer:

Tips for QA testing:

[nikspz]

Tests Performed:

• Cloned and installed feature branch
• start/ran simple_directional_strategy script, no issues showed
• start/ran advanced_directional_strategy script successfully

Note: there's a delay before advanced strategy start to place orders to Open position, discussed that it's expected

LGTM

[nikspz]

In behalf of Foundation team we merged this PR to development for the upcoming Hummingbot version 1.13.0