nixos/home-assistant: fix removing of uninstalled custom components

Before components was not an array and the first loop did never loop
through all entries but through the entire output of find without
splitting by new line.

Tested by copying the preStart script out of the nix store, doing the
change and observing that now the custom-components directory is indeed
being cleaned up after removing a custom component.

nixos/modules/services/home-automation/home-assistant.nix

@@ -468,8 +468,8 @@ in {
           mkdir -p "${cfg.configDir}/custom_components"
 
           # remove components symlinked in from below the /nix/store
-          components="$(find "${cfg.configDir}/custom_components" -maxdepth 1 -type l)"
-          for component in "$components"; do
+          readarray -d "" components < <(find "${cfg.configDir}/custom_components" -maxdepth 1 -type l -print0)
+          for component in "''${components[@]}"; do
             if [[ "$(readlink "$component")" =~ ^${escapeShellArg builtins.storeDir} ]]; then
               rm "$component"
             fi