docker: keep the worker's argument boundaries

Unquoted $@ splits on whitespace and expands globs, so an argument carrying
either arrived as something else.

Claude-Session: https://claude.ai/code/session_01Rkp1Mw5E89Jp6dzJFYiMrm

docker/entrypoint.sh

@@ -97,7 +97,7 @@ case "$1" in
   	  echo "Use 'worker' for the Go maintenance worker instead." >&2
   	  exit 1
   	fi
-  	exec /usr/bin/weed-worker $@
+  	exec /usr/bin/weed-worker "$@"
 	;;
 
   'server')