L2SS-480: fix RCU mask array dimension

tangostationcontrol/tangostationcontrol/devices/beam.py

@@ -130,7 +130,7 @@ class Beam(lofar_device):
         # Record where we now point to, now that we've updated the weights.
         # Only the entries within the mask have been updated
         mask = self.recv_proxy.RCU_mask_RW
-        for tile in range(96):
+        for tile in range(32):
             if mask[tile]:
                 self._hbat_pointing_direction[tile] = pointing_direction[tile]
                 self._hbat_pointing_timestamp[tile] = timestamp