[Remoting Android] Export CreditsActivity

remoting/android/java/AndroidManifest.xml.jinja2

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
         package="{{ APK_PACKAGE_NAME }}">
     <uses-sdk android:minSdkVersion="14"
             android:targetSdkVersion="23"/>
     <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
     <uses-permission android:name="android.permission.INTERNET"/>
 
     <application android:label="@string/product_name_android"
             android:name="org.chromium.chromoting.RemotingApplication"
@@ skipping 33 matching lines @@
             android:name="org.chromium.chromoting.Desktop"
             android:exported="false"
             android:windowSoftInputMode="adjustResize"/>
         <activity
             android:name="org.chromium.chromoting.help.HelpActivity"
             android:configChanges="orientation|screenSize"
             android:exported="false"
             android:uiOptions="splitActionBarWhenNarrow"/>
         <activity
             android:name="org.chromium.chromoting.help.CreditsActivity"
-            android:exported="false"/>
+            android:exported="true"/>
     </application>
 </manifest>