emacs-treesit-grammars: exclude broken grammars

Commit 9bfc2e203b marked the
tree-sitter-razor grammar as broken. This breaks building
emacsPackages.treesit-grammars.with-all-grammars as it pulls in that
broken grammar.

Excluding broken grammars from with-all-grammars seems more useful than
forcing its users to work around this (by either accepting the broken
grammar or manually excluding it using treesit-grammars.with-grammars).

pkgs/applications/editors/emacs/elisp-packages/manual-packages/treesit-grammars/package.nix

@@ -20,5 +20,5 @@ in
 {
   inherit with-grammars;
 
-  with-all-grammars = with-grammars builtins.attrValues;
+  with-all-grammars = with-grammars (ps: lib.filter (p: !p.meta.broken) (lib.attrValues ps));
 }