Fix buildType issue introduced in rebase (#23444)

Summary:
While rebasing #18892, I missed that buildTypeName no longer existed.

[ANDROID] [Fixed] - Fix issue in react.gradle
Pull Request resolved: #23444

Differential Revision: D14078281

Pulled By: hramos

fbshipit-source-id: c2b3a1dccb890392f47ed93a3e1ac6e62e50999a

react.gradle

@@ -78,8 +78,8 @@ afterEvaluate {
 
             enabled config."bundleIn${targetName}" != null
               ? config."bundleIn${targetName}"
-              : config."bundleIn${buildTypeName.capitalize()}" != null
-                ? config."bundleIn${buildTypeName.capitalize()}"
+              : config."bundleIn${variant.buildType.name.capitalize()}" != null
+                ? config."bundleIn${variant.buildType.name.capitalize()}"
                 : targetName.toLowerCase().contains("release")
         }