Fix RS/RL type in pkg/steep_icecavity #2915

Job	Run time
forward (offline_exf_seaice)	4m 31s
doc_html	2m 7s
openad (global_ocean.90x40x15)	9m 7s
doc_latex	3m 33s
openad-other (global_oce_latlon)	10m 17s
forward (global_ocean.cs32x15)	3m 25s
openad-other (halfpipe_streamice)	10m 44s
forward (tutorial_deep_convection)	2m 38s
openad-other (hs94.1x64x5)	7m 5s
forward (aim.5l_cs)	1m 37s
openad-other (isomip)	10m 58s
forward (isomip)	3m 0s
openad-other (tutorial_global_oce_biogeo)	9m 55s
forward (global_ocean.90x40x15)	1m 54s
openad-other (tutorial_global_oce_optim)	8m 1s
forward (tutorial_plume_on_slope)	1m 31s
openad-other (tutorial_tracer_adjsens)	9m 6s
forward (tutorial_advection_in_gyre)	1m 15s
forward (hs94.cs-32x32x5)	1m 32s
forward (tutorial_global_oce_biogeo)	1m 36s
forward (tutorial_global_oce_in_p)	1m 17s
forward (tutorial_cfc_offline)	1m 13s
	1h 46m 22s

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