Do not override treesitter lua highlighting with sumneko lua highlighting

Signed-off-by: David Ward <dward@redhat.com>

init.lua

@@ -382,6 +382,8 @@ require('lspconfig').sumneko_lua.setup {
       workspace = { library = vim.api.nvim_get_runtime_file('', true) },
       -- Do not send telemetry data containing a randomized but unique identifier
       telemetry = { enable = false },
+      -- Do not override treesitter lua highlighting with sumneko lua highlighting
+      semantic = { enable = false },
     },
   },
 }