LogBox fixes for OSS

Summary:
This diff fixes two issues with LogBox in OSS.

Changelog: [Internal]

Reviewed By: mmmulani

Differential Revision: D19165696

fbshipit-source-id: 4dd9c480ea3d2b205f8e65cb32203949b1e32e8a

Libraries/LogBox/Data/LogBoxData.js

@@ -74,7 +74,7 @@ let warningFilter: WarningFilter = function(format) {
   return {
     finalFormat: format,
     forceDialogImmediately: false,
-    suppressDialog_LEGACY: false,
+    suppressDialog_LEGACY: true,
     suppressCompletely: false,
     monitorEvent: 'unknown',
     monitorListVersion: 0,

Libraries/YellowBox/YellowBox.js

@@ -74,11 +74,12 @@ if (__DEV__) {
     }
 
     static install(): void {
-      _isInstalled = true;
       if (_isLogBoxEnabled) {
         LogBox.install();
         return;
       }
+      _isInstalled = true;
+
       errorImpl = function(...args) {
         registerError(...args);
       };