### 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
}
TEST_CASE("[String] SHA1/SHA256/MD5") {
	String s = "Godot";
	String sha1 = "a1e91f39b9fce6a9998b14bdbe2aa2b39dc2d201";
	static uint8_t sha1_buf[20] = {
		0xA1, 0xE9, 0x1F, 0x39, 0xB9, 0xFC, 0xE6, 0xA9, 0x99, 0x8B, 0x14, 0xBD, 0xBE, 0x2A, 0xA2, 0xB3,
		0x9D, 0xC2, 0xD2, 0x01
	};
	String sha256 = "2a02b2443f7985d89d09001086ae3dcfa6eb0f55c6ef170715d42328e16e6cb8";
	static uint8_t sha256_buf[32] = {
		0x2A, 0x02, 0xB2, 0x44, 0x3F, 0x79, 0x85, 0xD8, 0x9D, 0x09, 0x00, 0x10, 0x86, 0xAE, 0x3D, 0xCF,
		0xA6, 0xEB, 0x0F, 0x55, 0xC6, 0xEF, 0x17, 0x07, 0x15, 0xD4, 0x23, 0x28, 0xE1, 0x6E, 0x6C, 0xB8
	};
	String md5 = "4a336d087aeb0390da10ee2ea7cb87f8";
	static uint8_t md5_buf[16] = {
		0x4A, 0x33, 0x6D, 0x08, 0x7A, 0xEB, 0x03, 0x90, 0xDA, 0x10, 0xEE, 0x2E, 0xA7, 0xCB, 0x87, 0xF8
	};
	PackedByteArray buf = s.sha1_buffer();
	CHECK(memcmp(sha1_buf, buf.ptr(), 20) == 0);
	CHECK(s.sha1_text() == sha1);
	buf = s.sha256_buffer();
	CHECK(memcmp(sha256_buf, buf.ptr(), 32) == 0);
	CHECK(s.sha256_text() == sha256);
	buf = s.md5_buffer();
	CHECK(memcmp(md5_buf, buf.ptr(), 16) == 0);
	CHECK(s.md5_text() == md5);
}
TEST_CASE("[String] Join") {
	String s = ", ";
	Vector<String> parts;