BIM: remove 'show this dialog' checkbox from IFC Import and IFC Export prefs (#24728)

Fixes #24551

src/Mod/BIM/Resources/ui/preferences-ifc-export.ui

@@ -29,28 +29,6 @@
    <property name="bottomMargin">
     <number>9</number>
    </property>
-   <item>
-    <widget class="QGroupBox" name="group_box_0">
-     <property name="title">
-      <string>General Options</string>
-     </property>
-     <layout class="QVBoxLayout" name="verticalLayout">
-      <item>
-       <widget class="Gui::PrefCheckBox" name="checkBox_7">
-        <property name="text">
-         <string>Show this dialog when exporting</string>
-        </property>
-        <property name="prefEntry" stdset="0">
-         <cstring>ifcShowDialog</cstring>
-        </property>
-        <property name="prefPath" stdset="0">
-         <cstring>Mod/Arch</cstring>
-        </property>
-       </widget>
-      </item>
-     </layout>
-    </widget>
-   </item>
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">

src/Mod/BIM/Resources/ui/preferences-ifc.ui

@@ -26,19 +26,6 @@
       <string>General Options</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout_3">
-      <item>
-       <widget class="Gui::PrefCheckBox" name="checkBox_7">
-        <property name="text">
-         <string>Show this dialog when importing</string>
-        </property>
-        <property name="prefEntry" stdset="0">
-         <cstring>ifcShowDialog</cstring>
-        </property>
-        <property name="prefPath" stdset="0">
-         <cstring>Mod/Arch</cstring>
-        </property>
-       </widget>
-      </item>
       <item>
        <widget class="Gui::PrefCheckBox" name="gui::prefcheckbox_5">
         <property name="toolTip">

src/Mod/BIM/importers/exportIFC.py

@@ -170,8 +170,6 @@ def getPreferences():
 
     import ifcopenshell
 
-    if FreeCAD.GuiUp and params.get_param_arch("ifcShowDialog"):
-        FreeCADGui.showPreferencesByName("Import-Export", ":/ui/preferences-ifc-export.ui")
     ifcunit = params.get_param_arch("ifcUnit")
 
     # Factor to multiply the dimension in millimeters

src/Mod/BIM/importers/importIFCHelper.py

@@ -86,9 +86,6 @@ def getPreferences():
         2 = Part shapes
         3 = One compound per storey
     """
-    if FreeCAD.GuiUp and params.get_param_arch("ifcShowDialog"):
-        Gui.showPreferencesByName("Import-Export", ":/ui/preferences-ifc.ui")
-
     preferences = {
         "DEBUG": params.get_param_arch("ifcDebug"),
         "PREFIX_NUMBERS": params.get_param_arch("ifcPrefixNumbers"),