Add more extra <esc> keystrokes to boot command

The GitHub workflow video recording still shows that the initial `i` in
the `install` command is dropped, potentially because the initial <esc>
keystroke was never received by the first bootloader menu.

bullseye.json

@@ -20,6 +20,7 @@
 
             "http_directory": "http",
             "boot_command": [
+                "<esc><wait>",
                 "<esc><wait>",
                 "<esc><wait>",
                 "install <wait>",