fix(lsp): ltex_plus → ltex_ls_plus

- Naming conflicts with lspconfig: the `filetypes` field was overwritten
  by lspconfig.

lsp/ltex_ls_plus.lua

@@ -31,6 +31,18 @@ return {
   single_file_support = true,
   settings = {
     ltex = {
+      enabled = {
+        'markdown',
+        'pandoc',
+        'latex',
+        'text',
+        'norg',
+        'gitcommit',
+        'jj',
+        'jjdescription',
+        'rst',
+        'typst'
+      },
       language = "auto",
       diagnosticSeverity = "information",
       checkFrequency = "save",

lua/lsp.lua

@@ -163,4 +163,4 @@ end
 setup_godot_dap()
 
 vim.diagnostic.config({ virtual_text = true })
-vim.lsp.enable({ "ltex_plus", "rust-analyzer", "gdscript" })
+vim.lsp.enable({ "ltex_ls_plus", "rust-analyzer", "gdscript" })