Remove alias for invalid `brew cleanup --force`

`brew cleanup --force` produces the following error message: `Error: invalid option: --force`. I can't seem to find any record of this being a valid option for the cleanup command, so either it was deprecated in the stone age or it was a simple mistake. However, there is a `--force` option available for `brew uninstall`, but that's a dicey thing to alias.

modules/homebrew/init.zsh

@@ -27,7 +27,6 @@ fi
 
 # Homebrew
 alias brewc='brew cleanup'
-alias brewC='brew cleanup --force'
 alias brewi='brew install'
 alias brewl='brew list'
 alias brewo='brew outdated'