TARGET_BUILD_UNBUNDLED no longer disables flattening.

Test: art/build/apex/runtests.sh on master-art
Bug: 159109002
Change-Id: I653e7d096b10133a9c732bd8d12694cb0a1cbb6b
diff --git a/build/apex/runtests.sh b/build/apex/runtests.sh
index 51acd94..7e3f40f 100755
--- a/build/apex/runtests.sh
+++ b/build/apex/runtests.sh
@@ -48,9 +48,6 @@
 # TODO(b/159109002): Clean this up.
 if [ ! -d $ANDROID_BUILD_TOP/frameworks/base ]; then
   export TARGET_BUILD_UNBUNDLED=true
-  # Flattening is not supported in unbundled mode, regardless what
-  # TARGET_FLATTEN_APEX says.
-  flattened_apex_p=false
 fi
 
 have_debugfs_p=false