glsl: ir_function_param_visitor::visit_enter always true condition

glsl: ir_function_param_visitor::visit_enter always true condition

The condition

!param->type->is_vector() || !param->type->is_scalar()

alawys evaluates to true:

* type is not scalar or vector -> true
* type is vector, i.e. num_components > 1 -> num_components == 1 is
  false and !is_scalar() == true
* type is scalar, i.e. num_components == 1 -> num_components > 1 is
  false and !is_vector() == true

There is no comment explaining why such code has been written, therefore
this seems to be a mistake.

To maintain consistency with the surrounding code,
glsl_type_is_scalar_or_vector has been used instead of
replacing || with &&.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24914>