Don't modify the static character replacement table (#5)

When `#string()` gets called with `escapeQuotes == false`, it would
remove the replacement for `"` from the table without restoring it.
This, in turn, will cause later calls not to escape the quotes, even if
`escapeQuotes == true`.

Modifying the table is ugly IMO, I think it's better to do special check
for quote character.

json/src/main/java/org/quiltmc/parsers/json/JsonWriter.java

@@ -694,17 +694,16 @@ private void string(String value, boolean quotes, boolean escapeQuotes) throws I
 			out.write('\"');
 		}
 
-		if (!escapeQuotes) {
-			replacements['\"'] = null;
-		}
-
 		int last = 0;
 		int length = value.length();
 
 		for (int i = 0; i < length; i++) {
 			char c = value.charAt(i);
 			String replacement;
 			if (c < 128) {
+				if (c == '"' && !escapeQuotes) {
+					continue;
+				}
 				replacement = replacements[c];
 				if (replacement == null) {
 					continue;