Remove R parameter from xcompmgr

usr/lib/raspi-config/cmstart.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 if grep -q okay /proc/device-tree/soc/v3d@7ec00000/status 2> /dev/null || grep -q okay /proc/device-tree/soc/firmwarekms@7e600000/status 2> /dev/null ; then
     if ps ax | grep -v grep | grep -q openbox ; then
-        exec xcompmgr -aR
+        exec xcompmgr -a
     fi
 fi