Remove <uses-sdk> block from all samples

This value is now automatically merged in from build.gradle (which is
managed by template-params.xml). Removing it prevents conflicts in
the event uses-sdk doesn't match properly.

Change-Id: Icbe4aabac366a26a326cfa2ecd2cb57192634a1a
diff --git a/renderScript/BasicRenderScript/Application/AndroidManifest.xml b/renderScript/BasicRenderScript/Application/AndroidManifest.xml
index 1e35dc3..21c3a62 100644
--- a/renderScript/BasicRenderScript/Application/AndroidManifest.xml
+++ b/renderScript/BasicRenderScript/Application/AndroidManifest.xml
@@ -4,9 +4,7 @@
     android:versionCode="1"
     android:versionName="1.0" >
 
-    <uses-sdk
-        android:minSdkVersion="8"
-        android:targetSdkVersion="19" />
+    <!-- Min/target SDK versions (<uses-sdk>) managed by build.gradle -->
 
     <application
         android:allowBackup="true"