LibJS: Port ListFormat and PatternPartition to String

Author: https://github.com/trflynn89
Commit: 1bcde5d216
Pull-request: https://github.com/SerenityOS/serenity/pull/17122
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/nico

Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.h

@@ -74,7 +74,7 @@ private:
 };
 
 struct PatternPartitionWithUnit : public PatternPartition {
-    PatternPartitionWithUnit(StringView type, DeprecatedString value, StringView unit_string = {})
+    PatternPartitionWithUnit(StringView type, String value, StringView unit_string = {})
         : PatternPartition(type, move(value))
         , unit(unit_string)
     {