Reduce visibility of LogBoxDialog

Summary:
In an attempt to reduce footprint of React Native Android public APIs we are reducing visibility of classes and interfaces that are not meant to be used publicly OR are public but have no usages.
As part of our analysis, which involved looking for usages inside the Meta codebase and code search in OSS, we've detected that this class/interface is public but it's not used from other packages.

If you are using this class or interface please comment in this PR and we will restate the public access.

changelog: [Android][Changed] Reducing visibility of LogBoxDialog

bypass-github-export-checks

Reviewed By: arushikesarwani94

Differential Revision: D49803290

fbshipit-source-id: 17a301fd758bf3fcfb880b2647a7fd53bf7781a7

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/LogBoxDialog.java

@@ -14,7 +14,7 @@
 import com.facebook.react.R;
 
 /** Dialog for displaying JS errors in LogBox. */
-public class LogBoxDialog extends Dialog {
+class LogBoxDialog extends Dialog {
   public LogBoxDialog(Activity context, View reactRootView) {
     super(context, R.style.Theme_Catalyst_LogBox);