### Godot version

4.1.1

### System information

linux

### Issue description

The `"%+f"` format adds a `+` sign in front of positive numbers. If you try to format `-0.0`, it breaks and displays both a `+` and a `-`.

### Steps to reproduce

```gdscript
@tool
extends EditorScript

func _run() -> void:
    print("%+f" % -0.0)
```

### Minimal reproduction project

see above
} else if (c <= 0x001fffff) { // 
			fl += 4;
		} else if (c <= 0x03ffffff) { // 
			fl += 5;
			print_unicode_error(vformat("Invalid unicode codepoint (%x)", c));
		} else if (c <= 0x7fffffff) { // 
			fl += 6;
			print_unicode_error(vformat("Invalid unicode codepoint (%x)", c));
		} else {
			fl += 1;
			print_unicode_error(vformat("Invalid unicode codepoint (%x), cannot represent as UTF-8", c), true);
		}
	}
	Char utf8s;
	if (fl == 0) {
		return utf8s;
	}
	utf8s.resize(fl + 1);
	uint8_t *cdst = (uint8_t *)utf8s.get_data();
#define APPEND_CHAR(m_c) *(cdst++) = m_c
	for (int i = 0; i < l; i++) {
		uint32_t c = d[i];
		if (c <= 0x7f) { // 
			APPEND_CHAR(c);
		} else if (c <= 0x7ff) { // 
			APPEND_CHAR(uint32_t(0xc0 | ((c >> 6) & 0x1f))); // 
			APPEND_CHAR(uint32_t(0x80 | (c & 0x3f))); // 
		} else if (c <= 0xffff) { // 
			APPEND_CHAR(uint32_t(0xe0 | ((c >> 12) & 0x0f))); // 
			APPEND_CHAR(uint32_t(0x80 | ((c >> 6) & 0x3f))); //