Fix deprecated vim.lsp.diagnostic.get_count call

Author: Drake Nelson

lua/galaxyline/provider_diagnostic.lua

@@ -21,7 +21,9 @@ local function get_nvim_lsp_diagnostic(diag_type)
     local count = 0
 
     for _, client in ipairs(active_clients) do
-       count = count + lsp.diagnostic.get_count(api.nvim_get_current_buf(),diag_type,client.id)
+       local opts = { severity = diag_type }
+       opts.namespace = vim.diagnostic.get_namespace(client.id)
+       count = count + vim.diagnostic.get(api.nvim_get_current_buf(),opts)
     end
 
     if count ~= 0 then return count .. ' ' end