### 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
char32_t *dst = ptrw();
	dst[str_size] = 0;
	int skip = 0;
	uint32_t unichar = 0;
	while (cstr_size) {
		uint8_t c = *p_utf8 >= 0 ? *p_utf8 : uint8_t(256 + *p_utf8);
		if (skip == 0) {
			if (p_skip_cr && c == '\r') {
				p_utf8++;
				continue;
			}
			/* 
			if ((c & 0x80) == 0) {
				*(dst++) = c;
				unichar = 0;
				skip = 0;
			} else if ((c & 0xe0) == 0xc0) {
				unichar = (0xff >> 3) & c;
				skip = 1;
			} else if ((c & 0xf0) == 0xe0) {
				unichar = (0xff >> 4) & c;
				skip = 2;
			} else if ((c & 0xf8) == 0xf0) {
				unichar = (0xff >> 5) & c;
				skip = 3;
			} else if ((c & 0xfc) == 0xf8) {
				unichar = (0xff >> 6) & c;
				skip = 4;
			} else if ((c & 0xfe) == 0xfc) {
				unichar = (0xff >> 7) & c;