Fix incorrect check in cs_8559_5 in map_from_unicode()

The condition `code == 0x0450 || code == 0x045D` is always false because
of an incorrect range check on code.
According to the BMP coverage in the encoding spec for ISO-8859-5
(https://encoding.spec.whatwg.org/iso-8859-5-bmp.html) the range of
valid characters is 0x0401 - 0x045F (except for 0x040D, 0x0450, 0x045D).
The current check has an upper bound of 0x044F instead of 0x045F.
Fix this by changing the upper bound.

Author: nielsdos

ext/standard/html.c

@@ -477,7 +477,7 @@ static inline int map_from_unicode(unsigned code, enum entity_charset charset, u
 			*res = 0xF0; /* numero sign */
 		} else if (code == 0xA7) {
 			*res = 0xFD; /* section sign */
-		} else if (code >= 0x0401 && code <= 0x044F) {
+		} else if (code >= 0x0401 && code <= 0x045F) {
 			if (code == 0x040D || code == 0x0450 || code == 0x045D)
 				return FAILURE;
 			*res = code - 0x360;