[ox/std] Fix intToStr to have room for negatives

deps/ox/src/ox/std/istring.hpp

@@ -250,16 +250,16 @@ constexpr auto intToStr(Integer v) noexcept {
 		auto out = 0;
 		switch (sizeof(Integer)) {
 			case 1:
-				out = 3;
+				out = 4;
 				break;
 			case 2:
-				out = 5;
+				out = 6;
 				break;
 			case 4:
-				out = 10;
+				out = 11;
 				break;
 			case 8:
-				out = 21;
+				out = 22;
 				break;
 		}
 		return out + ox::is_signed_v<Integer>;