Move the assignment logic for dialogSettings.Flags to the common section.

Author: LeafShi1

src/System.Windows.Forms/System/Windows/Forms/Printing/PageSetupDialog.cs

@@ -301,19 +301,19 @@ protected override unsafe bool RunDialog(IntPtr hwndOwner)
                     toUnit = PrinterUnit.HundredthsOfAMillimeter;
                 }
             }
+        }
 
-            // Explicitly pass the unit flag to the native dialog so it operates in the unit selected
-            // by toUnit. This keeps the values written into rtMargin/rtMinMargin below and the values read
-            // back in UpdateSettings in the same unit, regardless of how system-level and user-level locale
-            // settings may differ.
-            if (toUnit == PrinterUnit.HundredthsOfAMillimeter)
-            {
-                dialogSettings.Flags |= PAGESETUPDLG_FLAGS.PSD_INHUNDREDTHSOFMILLIMETERS;
-            }
-            else
-            {
-                dialogSettings.Flags |= PAGESETUPDLG_FLAGS.PSD_INTHOUSANDTHSOFINCHES;
-            }
+        // Explicitly pass the unit flag to the native dialog so it operates in the unit selected
+        // by toUnit. This keeps the values written into rtMargin/rtMinMargin below and the values read
+        // back in UpdateSettings in the same unit, regardless of how system-level and user-level locale
+        // settings may differ.
+        if (toUnit == PrinterUnit.HundredthsOfAMillimeter)
+        {
+            dialogSettings.Flags |= PAGESETUPDLG_FLAGS.PSD_INHUNDREDTHSOFMILLIMETERS;
+        }
+        else
+        {
+            dialogSettings.Flags |= PAGESETUPDLG_FLAGS.PSD_INTHOUSANDTHSOFINCHES;
         }
 
         if (MinMargins is not null)