fix(treesitter_userconfig): add 'sh' to ensure_installed and update vim_filetypes

Author: dcai

after/plugin/treesitter_userconfig.lua

@@ -10,6 +10,7 @@ treesitter.setup({
 })
 
 local ensure_installed = {
+  'sh',
   'bash',
   'css',
   'diff',
@@ -38,7 +39,7 @@ local ensure_installed = {
 treesitter.install(ensure_installed)
 -- this is not always the same as treesitter parser names
 local vim_filetypes = {
-  'bash',
+  'sh',
   'css',
   'diff',
   'fish',