Allow disabling --graph with FORGIT_LOG_GRAPH_ENABLE=false in grc

[sandr01d]

Check list

• [X] I have performed a self-review of my code
• [ ] I have commented my code in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation

Description

We allow disabling the --graph option of git log when $FORGIT_LOG_GRAPH_ENABLE=false is set. This PR makes sure that this is also the case in _forgit_revert_commit that has been ignoring this until now.

Type of change

• [X] Bug fix
• [ ] New feature
• [ ] Refactor
• [ ] Breaking change
• [ ] Documentation change

Test environment

• Shell
  • [ ] bash
  • [X] zsh
  • [ ] fish
• OS
  • [X] Linux
  • [ ] Mac OS X
  • [ ] Windows
  • [ ] Others: