avoid using globals in blankline config

lua/plugins/configs/others.lua

@@ -43,9 +43,6 @@ M.better_escape = function()
 end
 
 M.blankline = function()
-   vim.g.indent_blankline_show_trailing_blankline_indent = false
-   vim.g.indent_blankline_show_first_indent_level = false
-
    require("indent_blankline").setup {
       indentLine_enabled = 1,
       char = "▏",
@@ -59,6 +56,8 @@ M.blankline = function()
          "TelescopeResults",
       },
       indent_blankline_buftype_exclude = { "terminal" },
+      show_trailing_blankline_indent = false,
+      show_first_indent_level = false,
    }
 end