Fix installer completions

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/nix-install/install.completion.zsh

@@ -18,8 +18,8 @@ _nix-install_completion() {
 
   _list_keys() {
     local flake="$(realpath ${words[2]})"
-    if [[ -d "$flake/secrets" ]]; then
-      find "$flake/secrets" -type f -name 'key.txt' | sed -E 's|^.*/secrets/([^/]+)/key.txt$|\1|' | sort -u
+    if [[ -d "$flake/submodules/secrets/domains" ]]; then
+      find "$flake/submodules/secrets/domains" -type f -name 'key.txt' | sed -E 's|^.*/submodules/secrets/domains/([^/]+)/key.txt$|\1|' | sort -u
     fi
   }