For non-BBL host printers (Moonraker/Klipper, Qidi, Snapmaker, Creality), switch_printer_agent() only re-selected the machine when the agent type changed. Switching between two printer presets that use the same agent left the selected machine and the agent's cached device_info pointing at the previously active preset's host, so filament sync kept hitting the old printer.
Re-select the machine when the agent type is unchanged but the target host differs, so the selected machine and device_info always follow the active printer preset.
Co-authored-by: Noisyfox <timemanager.rick@gmail.com>
