feat(clangd): remove proto filetype support #3959

Since #2125, we now have rich protobuf language servers and formatters such as
[buf](https://github.com/bufbuild/buf).

There are open hacks to getting around this by explicitly overriding the
default settings, but it's more idiomatic to have sensible defaults in
the protobuf lsp repo.

Author: bugreporter23

lsp/clangd.lua

@@ -62,7 +62,7 @@ end
 
 return {
   cmd = { 'clangd' },
-  filetypes = { 'c', 'cpp', 'objc', 'objcpp', 'cuda', 'proto' },
+  filetypes = { 'c', 'cpp', 'objc', 'objcpp', 'cuda' },
   root_markers = {
     '.clangd',
     '.clang-tidy',