atuin: don't install widget on limited terminals

Otherwise we get the following warning for terminals with limited
capabilities:

    bash: bind: warning: line editing not enabled

modules/programs/atuin.nix

@@ -89,12 +89,16 @@ in {
     };
 
     programs.bash.initExtra = mkIf cfg.enableBashIntegration ''
+      if [[ :$SHELLOPTS: =~ :(vi|emacs): ]]; then
         source "${pkgs.bash-preexec}/share/bash/bash-preexec.sh"
         eval "$(${cfg.package}/bin/atuin init bash)"
+      fi
     '';
 
     programs.zsh.initExtra = mkIf cfg.enableZshIntegration ''
+      if [[ $options[zle] = on ]]; then
         eval "$(${cfg.package}/bin/atuin init zsh)"
+      fi
     '';
 
     programs.fish.interactiveShellInit = mkIf cfg.enableFishIntegration ''