Sample Build: Remove invalid "include" in emitGradle

Remove "include" directive in emitGradle task.

Change-Id: Ib31c3bd9fb9b676ac3fab83bf67398e8d28ab35d
diff --git a/build.gradle b/build.gradle
index 840a787..d888c03 100644
--- a/build.gradle
+++ b/build.gradle
@@ -136,7 +136,6 @@
 
         // src directory needs to be consolidated, will be done in next section
         exclude "${samplegen.targetSampleModule()}/src/"
-        include "${samplegen.targetSampleModule()}/src/main/AndroidManifest.xml"
     }
 
     // Consolidate source directories