THRIFT-4661: Rust enum name wrong case in generated structs

Client: rs
diff --git a/lib/rs/test/thrifts/Base_Two.thrift b/lib/rs/test/thrifts/Base_Two.thrift
index b4b4ea1..caa6acb 100644
--- a/lib/rs/test/thrifts/Base_Two.thrift
+++ b/lib/rs/test/thrifts/Base_Two.thrift
@@ -23,9 +23,15 @@
 
 const i32 WaterWeight = 200
 
+enum brothType {
+  Miso,
+  shouyu,
+}
+
 struct Ramen {
   1: optional string ramenType
   2: required i32 noodleCount
+  3: brothType broth
 }
 
 struct Napkin {