Stop double-rendering diagnostics on the current line

virtual_text and virtual_lines.current_line were both on, so the cursor line
showed each message inline and again below it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lua/plugins/lspconfig.lua

@@ -2,7 +2,7 @@ return {
   "neovim/nvim-lspconfig",
   opts = {
     diagnostics = {
-      virtual_text = true,
+      virtual_text = false,
       virtual_lines = { current_line = true },
     },
     servers = {