Fix filament syncing by fixing nozzle diameter guards (#13330)

* Remove unused `get_printer_preset` calls.

* `Plater::check_printer_initialized` should skip nozzle flow type checks if nozzle is unknown.

Also remove unnecessary `is_multi_extruders` check.

* Remove unused `CalibUtils::is_same_nozzle_diameters()` fn.

* Simplify `CalibUtils::check_printable_status_before_cali`.

The single-arity can delegate to the vectorized arity.

* Add `DevExtruderSystem::NozzleDiameterMatchesOrUnknown` to simply checks.

* Update `CalibrationPresetPage::update_sync_button_status()` to use `NozzleDiameterMatchesOrUnknown`.

Simplify logic by iterating over each extruder and checking for diameter and volume type match.

The previous code had several mistakes (from what I could tell):

- `curr_obj->is_multi_extruders()` doesn't imply exactly 2 extruders
- the single/multi branch served no purpose
- the single branch failed to check the volume type

* Specify `std::fabs` and add explicit import.

Ref: https://github.com/OrcaSlicer/OrcaSlicer/pull/13330#discussion_r3133613736

Not sure how idiomatic this is in C++ / OrcaSlicer codebase, but CoPilot suggested it and it seems reasonable.

---------

Co-authored-by: SoftFever <softfeverever@gmail.com>

src/slic3r/GUI/DeviceCore/DevExtruderSystem.h

@@ -6,6 +6,7 @@
 #include <wx/string.h>
 
 #include "DevDefs.h"
+#include <cmath>
 
 namespace Slic3r
 {
@@ -145,6 +146,15 @@ public:
     float          GetNozzleDiameter(int extder_id) const { return GetExtderById(extder_id) ? GetExtderById(extder_id)->GetNozzleDiameter() : 0.0; }
     int            GetNozzleTempCurrent(int extder_id) const { return GetExtderById(extder_id) ? GetExtderById(extder_id)->GetCurrentTemp() : 0; }
     int            GetNozzleTempTarget(int extder_id) const { return GetExtderById(extder_id) ? GetExtderById(extder_id)->GetTargetTemp() : 0; }
+    bool           NozzleDiameterMatchesOrUnknown(int extder_id, float target_diameter) const
+    {
+        float diameter = GetNozzleDiameter(extder_id);
+        if (diameter == 0.0f) {
+            return true;
+        } else {
+            return std::fabs(diameter - target_diameter) < 1e-3;
+        }
+    }
 
     // get slot info which is connected to the extruder
     std::string GetCurrentAmsId() const;