fix magnet current

The actual_current channel has been renamed to actualCurrent.

Load.py

@@ -139,7 +139,7 @@ mnemonics = {
               'key':'value.value',
               'dim':None},
     "magnet": {'source':'SCS_CDIFFT_MAG/SUPPLY/CURRENT',
-               'key':'actual_current.value',
+               'key':'actualCurrent.value',
                'dim':None},
 
     # FastCCD, if in raw folder, raw images