Decouple should_start_fresh_session from use_relative_path

so IFC files always open in a clean session

src/bonsai/bonsai/bim/module/project/operator.py

@@ -968,7 +968,7 @@ class LoadProject(bpy.types.Operator, IFCFileSelector, ImportHelper):
     )
     should_start_fresh_session: bpy.props.BoolProperty(
         name="Should Start Fresh Session",
-        description="Clear current Blender session before loading IFC. Not supported with 'Use Relative Path' option",
+        description="Clear current Blender session before loading IFC",
         default=True,
     )
     import_without_ifc_data: bpy.props.BoolProperty(
@@ -1076,9 +1076,6 @@ class LoadProject(bpy.types.Operator, IFCFileSelector, ImportHelper):
             bpy.app.handlers.load_post.remove(load_handler)
             self.finish_loading_project(context)
 
-        if self.use_relative_path:
-            self.should_start_fresh_session = False
-
         if self.should_start_fresh_session:
             # WARNING: wm.read_homefile clears context which could lead to some
             # operators to fail:
@@ -1143,8 +1140,6 @@ class LoadProject(bpy.types.Operator, IFCFileSelector, ImportHelper):
         return ImportHelper.invoke(self, context, event)
 
     def draw(self, context):
-        if self.use_relative_path:
-            self.should_start_fresh_session = False
         self.layout.prop(self, "is_advanced")
         self.layout.prop(self, "should_start_fresh_session")
         self.layout.prop(self, "import_without_ifc_data")