Deduplicate `string::parse_utf32(char32_t)` in favor of just using the `Span` based function.

core/string/ustring.cpp

@@ -347,29 +347,6 @@ void String::parse_utf32(const Span<char32_t> &p_cstr) {
 	*dst = 0;
 }
 
-void String::parse_utf32(const char32_t &p_char) {
-	if (p_char == 0) {
-		print_unicode_error("NUL character", true);
-		return;
-	}
-
-	resize(2);
-
-	char32_t *dst = ptrw();
-
-	if ((p_char & 0xfffff800) == 0xd800) {
-		print_unicode_error(vformat("Unpaired surrogate (%x)", (uint32_t)p_char));
-		dst[0] = _replacement_char;
-	} else if (p_char > 0x10ffff) {
-		print_unicode_error(vformat("Invalid unicode codepoint (%x)", (uint32_t)p_char));
-		dst[0] = _replacement_char;
-	} else {
-		dst[0] = p_char;
-	}
-
-	dst[1] = 0;
-}
-
 // assumes the following have already been validated:
 // p_char != nullptr
 // p_length > 0

core/string/ustring.h

@@ -436,7 +436,7 @@ public:
 	static String num_uint64(uint64_t p_num, int base = 10, bool capitalize_hex = false);
 	static String chr(char32_t p_char) {
 		String string;
-		string.parse_utf32(p_char);
+		string.parse_utf32(Span(&p_char, 1));
 		return string;
 	}
 	static String md5(const uint8_t *p_md5);
@@ -540,7 +540,6 @@ public:
 	static String utf16(const Span<char16_t> &p_range) { return utf16(p_range.ptr(), p_range.size()); }
 
 	void parse_utf32(const Span<char32_t> &p_cstr);
-	void parse_utf32(const char32_t &p_char);
 
 	static uint32_t hash(const char32_t *p_cstr, int p_len); /* hash the string */
 	static uint32_t hash(const char32_t *p_cstr); /* hash the string */