watson: Install fish completions.

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pkgs/applications/office/watson/default.nix
··· 30 postInstall = '' 31 installShellCompletion --bash --name watson watson.completion 32 installShellCompletion --zsh --name _watson watson.zsh-completion 33 ''; 34 35 checkInputs = [ pytestCheckHook pytest-mock mock pytest-datafiles ];
··· 30 postInstall = '' 31 installShellCompletion --bash --name watson watson.completion 32 installShellCompletion --zsh --name _watson watson.zsh-completion 33 + installShellCompletion --fish watson.fish 34 ''; 35 36 checkInputs = [ pytestCheckHook pytest-mock mock pytest-datafiles ];