Fix a bug in InlinePresentationStyleUtils#bundleEquals

* before the fix, the method would return false if the two bundles both
  contains a nested bundle for the same key, and the nested bundles are
  equal. i.e. the test case
  InlinePresentationStyleUtilsTest#testBundleEquals_nestedBundle_equal
  would fail.

Test: atest InlinePresentationStyleUtilsTest
Bug: 154957669

Change-Id: Ia2cf682619fa245d846972a8683d03333551df78