Add test for !1370

The bug fixed in !1370 was due to a reuse of the per app anti features
dictionary in the per version one and adding the per version anti
features into it. This was not caught by the test suite as the app
versions are processed from newest to oldest and the test data had only
anti features in the oldest version. This patch adds an anti feature to
a newest version so only those in between should not have it.

tests/metadata/dump/com.politedroid.yaml

@@ -122,7 +122,10 @@ Builds:
   versionName: '1.4'
 - androidupdate: []
   antcommands: []
-  antifeatures: {}
+  antifeatures:
+    KnownVuln: {}
+    NonFreeAssets: {}
+    UpstreamNonFree: {}
   binary: null
   build: ''
   buildjni: []