Fix display step guard: skip only for published bindings

cuda_python*.whl exists for both main (current-run artifact) and
backport (downloaded from prior branch). Only published mode has
no local wheel file.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: leofang

.github/workflows/test-wheel-linux.yml

@@ -199,7 +199,7 @@ jobs:
           rmdir cuda-python-wheel
 
       - name: Display structure of downloaded cuda-python artifacts
-        if: ${{ env.BINDINGS_SOURCE == 'main' }}
+        if: ${{ env.BINDINGS_SOURCE != 'published' }}
         run: |
           pwd
           ls -lah cuda_python*.whl cuda_pathfinder/

.github/workflows/test-wheel-windows.yml

@@ -185,7 +185,7 @@ jobs:
           rmdir cuda-python-wheel
 
       - name: Display structure of downloaded cuda-python artifacts
-        if: ${{ env.BINDINGS_SOURCE == 'main' }}
+        if: ${{ env.BINDINGS_SOURCE != 'published' }}
         run: |
           Get-Location
           Get-ChildItem cuda_python*.whl | Select-Object Mode, LastWriteTime, Length, FullName