fix(defaults): use api.get_clients() (#142)

Author: icholy

lua/lsp-progress/defaults.lua

@@ -1,3 +1,5 @@
+local api = require("lsp-progress.api")
+
 --- @alias lsp_progress.Configs table<any, any>
 --- @type lsp_progress.Configs
 local Defaults = {
@@ -134,7 +136,7 @@ local Defaults = {
         if #client_messages > 0 then
             return sign .. " " .. table.concat(client_messages, " ")
         end
-        if #vim.lsp.get_active_clients() > 0 then
+        if #api.lsp_clients() > 0 then
             return sign
         end
         return ""