Remove ununsed channel config parameter (#150)

Unset Channel_config per COSIMA/access-om3#233

MOM_input

@@ -119,17 +119,6 @@ MINIMUM_DEPTH = 0.5             !   [m] default = 0.0
                                 ! MASKING_DEPTH are rounded to MINIMUM_DEPTH.
 MAXIMUM_DEPTH = 6000.0          !   [m]
                                 ! The maximum depth of the ocean.
-CHANNEL_CONFIG = "global_1deg"  ! default = "none"
-                                ! A parameter that determines which set of channels are
-                                ! restricted to specific  widths.  Options are:
-                                !     none - All channels have the grid width.
-                                !     global_1deg - Sets 16 specific channels appropriate
-                                !       for a 1-degree model, as used in CM2G.
-                                !     list - Read the channel locations and widths from a
-                                !       text file, like MOM_channel_list in the MOM_SIS
-                                !       test case.
-                                !     file - Read open face widths everywhere from a
-                                !       NetCDF file on the model grid.
 
 ! === module MOM_verticalGrid ===
 ! Parameters providing information about the vertical grid.