Set hist_suffix for cice history output. This can only be one charact…

…er at this point, and the userscript to concat ice daily output expects the default name to be used. See COSIMA/access-om3#201

ice_in

@@ -5,6 +5,7 @@
   dumpfreq = "y"
   dump_last = .true.
   histfreq = "d", "m", "x", "x", "x"
+  hist_suffix = "", "m", "x", "x", "x" !limited to one character due to https://github.com/COSIMA/access-om3/issues/201
   hist_time_axis = "middle"
   history_deflate = 1
   history_chunksize = 180, 150