### Godot version

v4.0.beta13.official [caacade56]

### System information

Linux Ubuntu 20.04 with Unity desktop

### Issue description

When calling an undefined function in the shader editor with argument(s), such as `undefined_function(1)`, the error reads:

> Too many arguments for "undefined_function()" call. Expected at most 0 but received 1.

instead of the expected:

> No matching function found for: 'undefined_function'.

This is possibly a regression introduced in https://github.com/godotengine/godot/issues/18225, since the latter was focused on the arguments part.

To avoid such regression in the future, consider adding a unit test with this case (and, in fact, unit tests for the other signature errors too if there are not already).

### Steps to reproduce

1. Create a shader resource and open the shader editor
2. Enter `undefined_function(1);` in the fragment() definition

### Minimal reproduction project

N/A
is_constant = true;
					tk = _get_token();
				}
				if (is_token_precision(tk.type)) {
					precision = get_token_precision(tk.type);
					tk = _get_token();
				}
				if (shader->structs.has(tk.text)) {
					is_struct = true;
					struct_name = tk.text;
				} else {
#ifdef DEBUG_ENABLED
					if (_lookup_next(next)) {
						if (next.type == TK_UNIFORM) {
							keyword_completion_context = CF_UNIFORM_QUALIFIER;
						}
					}
#endif 
					if (!is_token_datatype(tk.type)) {
						_set_error(RTR("Expected constant, function, uniform or varying."));
						return ERR_PARSE_ERROR;
					}
					if (!is_token_variable_datatype(tk.type)) {
						if (is_constant) {
							_set_error(RTR("Invalid constant type (samplers are not allowed)."));
						} else {
							_set_error(RTR("Invalid function type (samplers are not allowed)."));
						}
						return ERR_PARSE_ERROR;
					}