update spectrograph bench temperature column name in db to be meaningful.

temps1:
['motor_rda',
 'motor_shutter_b',
 'motor_shutter_r',
 'bia_box_top',
 'bia_box_bottom',
 'fiber_unit_hexapod_bottom',
 'fiber_unit_hexapod_top',
 'fiber_unit_fiber_frame_top',
 'collimator_frame_bottom',
 'collimator_frame_top']

temps2:
['bench_left_top',
 'bench_left_botton',
 'bench_right_top',
 'bench_right_bottom',
 'bench_far_top',
 'bench_far_bottom',
 'bench_near_top',
 'bench_near_bottom',
 'bench_central_top',
 'enu_temp_20']