polybar: correcting indentation

modules/services/polybar.nix

@@ -10,7 +10,7 @@ let
 
   toPolybarIni = generators.toINI {
     mkKeyValue = key: value:
-   let
+    let
       quoted = v:
         if hasPrefix " " v || hasSuffix " " v
         then ''"${v}"''
@@ -20,7 +20,7 @@ let
         if isBool value then (if value then "true" else "false")
         else if (isString value && key != "include-file") then quoted value
         else toString value;
-    in
+     in
       "${key}=${value'}";
   };