gitea: Fix substitution in wrong file after rebasing a patch

This command is needed to substitute @data@ which is added by
static-root-path.patch. When this patch was rebased for 1.19.0,
the file name changed, but the command was not updated.

pkgs/applications/version-management/gitea/default.nix

@@ -34,7 +34,7 @@ buildGoModule rec {
   ];
 
   postPatch = ''
-    substituteInPlace modules/setting/setting.go --subst-var data
+    substituteInPlace modules/setting/server.go --subst-var data
   '';
 
   subPackages = [ "." ];