Update build-usbsid-on-push.yml

Author: LouDnl

.github/workflows/build-usbsid-on-push.yml

@@ -242,7 +242,7 @@ jobs:
           run: |
             mkdir -p vice/src/lib/libusbsiddrv
             cd $PATH_SOURCE_CHECKOUT
-            cp -u $FILES ../vice/src/lib/libusbsiddrv/
+            cp $FILES ../vice/src/lib/libusbsiddrv/
             cd ..
 
         - name: Download Documentation