Fix bug where homebrew replacement wouldn't work

[cjappl]

Check list

• 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

In our homebrew formula, we were replacing this line in the installation:

 Replace this:             'set -x FORGIT "$FORGIT_INSTALL_DIR/bin/git-forgit"',
  with this     :             "set -x FORGIT \"#{opt_prefix}/bin/git-forgit\""

However, later in the fish script, we ignored that, just basing it directly off of the install dir:

alias git-forgit "$FORGIT_INSTALL_DIR/bin/git-forgit"

This makes sure that we always line up and don't have `fish: Unknown command: /opt/homebrew/share/conf.d/bin/git-forgit

• (line 1):` as in Brew installation of fish shell plugin failing  #377

Fixes #377

Type of change

• Bug fix

Test environment

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

[wfxr]

LGTM