Update example_hashmaps_remove.f90

Remove reference to 'other_type'.

Author: chuckyvt

example/hashmaps/example_hashmaps_remove.f90

@@ -2,7 +2,7 @@ program example_remove
   use stdlib_kinds, only: int8, int64
   use stdlib_hashmaps, only: open_hashmap_type
   use stdlib_hashmap_wrappers, only: fnv_1_hasher, &
-                                     fnv_1a_hasher, key_type, other_type, set
+                                     fnv_1a_hasher, key_type, set
   implicit none
   type(open_hashmap_type) :: map
   type(key_type)      :: key