### 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
keyword_completion_context ^= datatype_flag;
						}
					}
				} else {
					datatype_flag = CF_UNIFORM_TYPE;
					keyword_completion_context = CF_PRECISION_MODIFIER | datatype_flag;
					if (_lookup_next(next)) {
						if (is_token_precision(next.type)) {
							keyword_completion_context ^= (CF_PRECISION_MODIFIER | datatype_flag);
						} else if (is_token_datatype(next.type)) {
							keyword_completion_context ^= datatype_flag;
						}
					}
				}
#endif 
				if (is_token_interpolation(tk.type)) {
					if (is_uniform) {
						_set_error(RTR("Interpolation qualifiers are not supported for uniforms."));
#ifdef DEBUG_ENABLED
						temp_error = true;
#else
						return ERR_PARSE_ERROR;
#endif 
					}
					interpolation = get_token_interpolation(tk.type);
					tk = _get_token();
#ifdef DEBUG_ENABLED
					if (keyword_completion_context & CF_INTERPOLATION_QUALIFIER) {
						keyword_completion_context ^= CF_INTERPOLATION_QUALIFIER;
					}