minor fix with strings

hosts/common/users/media/default.nix

@@ -9,7 +9,7 @@ let
 
 in 
 {
-  users.users."${username}" = {
+  users.users.${username} = {
     isNormalUser = true;
     shell = pkgs.zsh; # default shell
     hashedPasswordFile = sopsHashedPasswordFile;
@@ -28,7 +28,7 @@ in
 
   environment.persistence."/persist" = {
     hideMounts = true;
-    users."${username}"= {
+    users.${username}= {
         directories = [
           "sync"
           "keep"
@@ -69,7 +69,7 @@ in
   home-manager = {
     extraSpecialArgs = { inherit inputs; };
     users = {
-      "${username}" = import ../../../../home/${hostname}.nix;
+      ${username} = import ../../../../home/${hostname}.nix;
     };
   };
 }