Replace `Region_6_SHP_triplet` with new run

I could not reproduce the old run. And we need to update this input
directory because of the change of DBF field `date_index` to `days_1950`.

Overlap/Tests/Input/Region_6_SHP_triplet/grid_nml.txt

-&grid_nml CORNER_DEG      = 5.875000       , -32.12500      ,
+ &GRID_NML
+ CORNER_DEG      = 5.875000       , -32.12500      ,
+ STEP_DEG        = 2*0.2500000      ,
  NLON    = 26,
- NLAT    = 22 /
+ NLAT    = 22
+ /

Overlap/Tests/Input/Region_6_SHP_triplet/ishape_last.txt

-5
-12
+ 6
+13

Overlap/Tests/Input/Region_6_SHP_triplet/used_nml.txt

+ &MAIN_NML
+ MIN_AMP = 1.0000000E-03  ,
+ MAX_RADIUS      = 2*20,
+ MIN_RADIUS      = 25.00000       
+ /