Add <uses-sdk> in manifest files of test apks

Change-Id: If5d0aeba8fadb25f67bcd9132dd6c56e5bf9899e

tests/AndroidManifest.xml

@@ -17,6 +17,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.inputmethod.latin.tests">
 
+    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="16" />
+
     <uses-permission android:name="android.permission.READ_CONTACTS" />
 
     <application>