fix code mistakes

Author: LonelyCat124

src/psyclone/psyir/nodes/intrinsic_call.py

@@ -2427,7 +2427,6 @@ class Intrinsic(IAttr, Enum):
                 max_count=1,
                 types=DataNode,
                 arg_names=(("x",),)),
-            required_args=ArgDesc(1, 1, (DataNode)),
             optional_args={},
             return_type=_get_first_argument_type,
             reference_accesses=None,

src/psyclone/tests/psyir/nodes/intrinsic_call_test.py

@@ -1293,8 +1293,8 @@ def test_reduce_return_type(fortran_reader):
     integer, dimension(100) :: z
     integer :: y
     y = REDUCE(x, test)
-    z = REDUCE(x, test, 2)
-    y = REDUCE(z, test, 2)
+    z = REDUCE(x, test, dim=2)
+    y = REDUCE(z, test, dim=2)
     end subroutine test
     """
     psyir = fortran_reader.psyir_from_source(code)