modules/home-manager: fix syntax error
modules/home-manager: fix syntax error

Fixes the error

    error: syntax error, unexpected $undefined, expecting IND_STR or
    DOLLAR_CURLY or IND_STRING_CLOSE, at
    .../home-manager/modules/programs/home-manager.nix:70:47

rycee/home-manager,rycee/home-manager,rycee/home-manager