### 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 <= 0x10ffff) { // 
			fl += 2;
		} else {
			print_unicode_error(vformat("Invalid unicode codepoint (%x), cannot represent as UTF-16", c), true);
			fl += 1;
		}
	}
	Char16 utf16s;
	if (fl == 0) {
		return utf16s;
	}
	utf16s.resize(fl + 1);
	uint16_t *cdst = (uint16_t *)utf16s.get_data();
#define APPEND_CHAR(m_c) *(cdst++) = m_c
	for (int i = 0; i < l; i++) {
		uint32_t c = d[i];
		if (c <= 0xffff) { // 
			APPEND_CHAR(c);
		} else if (c <= 0x10ffff) { // 
			APPEND_CHAR(uint32_t((c >> 10) + 0xd7c0)); // 
			APPEND_CHAR(uint32_t((c & 0x3ff) | 0xdc00)); // 
		} else {
			// 
			APPEND_CHAR(uint32_t((_replacement_char >> 10) + 0xd7c0));
			APPEND_CHAR(uint32_t((_replacement_char & 0x3ff) | 0xdc00));
		}
	}
#undef APPEND_CHAR
	*cdst = 0; //
	return utf16s;