Change default value of eddy index

Because the numbering changed when we decided not to write invalid eddies.

Inst_eddies/Tests/test_nearby_extr.f90

@@ -22,7 +22,7 @@ program test_nearby_extr
   real, allocatable:: nearby(:, :) ! (2, :) longitude and
   ! latitude, in rad, of extrema near the target extremum
 
-  integer:: i = 4
+  integer:: i = 3
   namelist /main_nml/ i
 
   !-------------------------------------------------------------------------