Keep BOARD_DESIGN_SETTINGS DRC marker exclusions up-to-date.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/17429

(manually cherry picked from commit 0598ca0f90)

pcbnew/python/scripting/pcbnew_scripting_helpers.cpp

@@ -611,9 +611,8 @@ bool WriteDRCReport( BOARD* aBoard, const wxString& aFileName, EDA_UNITS aUnits,
     engine->RunTests( aUnits, aReportAllTrackErrors, false );
     engine->ClearViolationHandler();
 
-    // now "resolve" the drc exclusions again because its the only way to set exclusion status on a marker
-    for( PCB_MARKER* marker : aBoard->ResolveDRCExclusions( false ) )
-        aBoard->Add( marker );
+    // Update the exclusion status on any excluded markers that still exist.
+    aBoard->ResolveDRCExclusions( false );
 
     // TODO: Unify this with DIALOG_DRC::writeReport