Disable ASCII_STRING_CHARACTERS option

Our patched copy of Fernflower no longer produces char literals in
inappropriate places (e.g. bit shifts). This removes the requirement for
this option, allowing non-English string literals to read nicely.

decompiler/src/main/java/dev/openrs2/decompiler/Decompiler.kt

@@ -52,7 +52,6 @@ class Decompiler(
 
     companion object {
         private val OPTIONS = mapOf(
-            IFernflowerPreferences.ASCII_STRING_CHARACTERS to "1",
             IFernflowerPreferences.INDENT_STRING to "\t",
             IFernflowerPreferences.SYNTHETIC_NOT_SET to "1"
         )