### 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
_set_error(RTR("Expected a function name after type."));
					}
					return ERR_PARSE_ERROR;
				}
				if (shader->structs.has(name) || _find_identifier(nullptr, false, constants, name) || has_builtin(p_functions, name)) {
					_set_redefinition_error(String(name));
					return ERR_PARSE_ERROR;
				}
				tk = _get_token();
				if (tk.type != TK_PARENTHESIS_OPEN) {
					if (type == TYPE_VOID) {
						_set_error(RTR("Expected '(' after function identifier."));
						return ERR_PARSE_ERROR;
					}
					
					while (true) {
						ShaderNode::Constant constant;
						constant.name = name;
						constant.type = is_struct ? TYPE_STRUCT : type;
						constant.type_str = struct_name;
						constant.precision = precision;
						constant.initializer = nullptr;
						constant.array_size = array_size;
						is_const_decl = true;
						if (tk.type == TK_BRACKET_OPEN) {
							Error error = _parse_array_size(nullptr, constants, false, nullptr, &constant.array_size, &unknown_size);
							if (error != OK) {
								return error;
							}
							tk = _get_token();