### 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
const char *ptrtmp_limit = &p_utf8[p_len];
		int skip = 0;
		uint8_t c_start = 0;
		while (ptrtmp != ptrtmp_limit && *ptrtmp) {
			uint8_t c = *ptrtmp >= 0 ? *ptrtmp : uint8_t(256 + *ptrtmp);
			if (skip == 0) {
				if (p_skip_cr && c == '\r') {
					ptrtmp++;
					continue;
				}
				/* 
				if ((c & 0x80) == 0) {
					skip = 0;
				} else if ((c & 0xe0) == 0xc0) {
					skip = 1;
				} else if ((c & 0xf0) == 0xe0) {
					skip = 2;
				} else if ((c & 0xf8) == 0xf0) {
					skip = 3;
				} else if ((c & 0xfc) == 0xf8) {
					skip = 4;
				} else if ((c & 0xfe) == 0xfc) {
					skip = 5;
				} else {
					skip = 0;
					print_unicode_error(vformat("Invalid UTF-8 leading byte (%x)", c), true);
					decode_ = true;
				}
				c_start = c;
				if (skip == 1 && (c & 0x1e) == 0) {