feat: add 'Use other AMS slot' button to filament runout dialog

[BenJule]

Summary

Closes #10870

When the printer pauses with filament ran out (stage 6) and an AMS is connected, the error dialog now shows an additional "Use other AMS slot" button alongside the existing options.

How it works

1. User sees the filament-runout error dialog as usual
2. If an AMS with at least one loaded slot is detected, the new button appears
3. Clicking it opens a slot picker listing all AMS slots that currently have filament loaded (name, slot number, filament type)
4. After confirming a slot the slicer sends M620 P{tray_id} to select the tray and resumes the print via command_hms_resume
5. The printer then performs its normal filament-change sequence to load the chosen spool and continues

If no AMS slots have filament the button is hidden (the button injection checks HasAms() and the picker validates is_exists on each tray). Cancelling the picker keeps the error dialog open.

Changes

File	Change
src/slic3r/GUI/DeviceErrorDialog.hpp	New USE_OTHER_AMS_SLOT = 60 enum value
src/slic3r/GUI/DeviceErrorDialog.cpp	Button init, handler with slot picker, injection into show_error_code() when stage_curr == 6

Before / After

Before	After
Filament ran out → only "Resume (problem solved)" / "Check Assistant"	Filament ran out + AMS connected → additionally "Use other AMS slot" button
User must manually trick AMS by assigning the same filament to another slot	User picks any loaded slot directly from the error dialog