refactor: writeFishApplication body

overlays/builders.nix

@@ -18,10 +18,8 @@ with final.lib;
         preferLocalBuild = false;
         text = ''
           #!${getExe final.fish}
-        '' + optionalString (runtimeInputs != [ ]) ''
 
-        export PATH="${makeBinPath runtimeInputs}:$PATH"
-      '' + ''
+          ${optionalString (runtimeInputs != [ ]) ''export PATH="${makeBinPath runtimeInputs}:$PATH"''}
 
           ${content}
         '';
@@ -35,9 +33,7 @@ with final.lib;
           else checkPhase;
       };
 
-
       script = fishFile "/bin/${name}" text;
-
       completions_file = fishFile "/share/fish/vendor_completions.d/${name}.fish" completions;
     in
     final.symlinkJoin {