opengl: tests: Add explict android:exported flag to manifests on GLDual.apk

After Android S+, it's required to add android:exported flag on manifests
if an intent filter is defined. We have added this flag on serveral apps
by previous change[1]. This is a follow-up change for GLDual.apk.

[1]: https://android.googlesource.com/platform/frameworks/native/+/8e8ae4222f9fb0499af755a4255cceb89a79bd78

Test: The GLDual.apk can be installed successfully on Android 14 devices.

Bug: 315418422
Change-Id: Iead9ab7b5e6ebe954b6883289aef70cd6d192ad1
diff --git a/opengl/tests/gldual/AndroidManifest.xml b/opengl/tests/gldual/AndroidManifest.xml
index a36f4f7..d6335b0 100644
--- a/opengl/tests/gldual/AndroidManifest.xml
+++ b/opengl/tests/gldual/AndroidManifest.xml
@@ -20,8 +20,9 @@
             android:label="@string/gldual_activity">
         <activity android:name="GLDualActivity"
                 android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
-            	android:launchMode="singleTask"
-            	android:configChanges="orientation|keyboardHidden">
+                android:launchMode="singleTask"
+                android:configChanges="orientation|keyboardHidden"
+                android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />