fix: prevent double running of git command

Should improve loading times significantly

lua/persisted/init.lua

@@ -89,10 +89,6 @@ end
 function M.setup(opts)
   config.setup(opts)
 
-  if M.session_exists() then
-    vim.g.persisted_exists = true
-  end
-
   if
     config.options.autosave
     and (allow_dir() and not ignore_dir() and vim.g.persisting == nil)

lua/persisted/utils.lua

@@ -86,6 +86,7 @@ function M.load_session(session, silent)
     return echoerr("Error loading the session! ", result)
   end
 
+  vim.g.persisted_exists = true
   vim.g.persisted_loaded_session = session
   vim.api.nvim_exec_autocmds("User", { pattern = "PersistedLoadPost", data = session })
 end