change indent-blankline indent chars back to a solid bar

the dashed line bar looks weird now in neovim gui's (e.g. neovide)
now with the adjusted font settings (negative linespacing)

lua/plugins/indent-blankline.lua

@@ -13,8 +13,8 @@ return {
       return {
         enabled = false,
         indent = {
-          char = '┊',
-          tab_char = '┊',
+          char = '│',
+          tab_char = '│',
         },
         scope = {
           show_start = false,