fix(utils): when locking a buffer, only stopinsert if buffer is current (#1917)

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

lua/avante/utils/init.lua

@@ -473,7 +473,7 @@ function M.unlock_buf(bufnr)
 end
 
 function M.lock_buf(bufnr)
-  vim.cmd("noautocmd stopinsert")
+  if bufnr == api.nvim_get_current_buf() then vim.cmd("noautocmd stopinsert") end
   vim.bo[bufnr].readonly = true
   vim.bo[bufnr].modified = false
   vim.bo[bufnr].modifiable = false