Moves a land test to a different test suite

The land test for simple domain decomposition, which uses 2 threads, is moved
to the `e3sm_land_exenoshare`.

[BFB]

Author: bishtgautam

cime_config/tests.py

@@ -41,7 +41,6 @@
         "time"  : "0:45:00",
         "tests" : (
             "ERS.f09_g16.IELMBC",
-            "ERS.f09_g16.IELMBC.elm-simple_decomp",
             "ERS.f19_g16.I1850CNECACNTBC.elm-eca",
             "ERS.f19_g16.I1850CNECACTCBC.elm-eca",
             "ERS.f19_g16.I1850CNRDCTCBC.elm-rd",
@@ -57,6 +56,7 @@
         "tests" : (
             "ERS_Ld20.f45_f45.IELMFATES.elm-fates",
             "ERS.hcru_hcru.I20TRGSWCNPRDCTCBC.elm-erosion",
+            "ERS.f09_g16.IELMBC.elm-simple_decomp",
             )
         },