Fix segmentation fault in aapt2

When passing a single iterator to std::vector::eraase, only element at
that iterator is removed. If no elements are filtered, std::remove_if()
returns the end iterator, attempting to erase() the end iterator can
cause segmentation fault. This bug causes signing test to fail.
https://atp.googleplex.com/tests/asit/ota/signing?tabId=test_run

Test: aapt2
PRODUCT/app/CalculatorGooglePrebuilt/CalculatorGooglePrebuilt.apk

Bug: 175789289
Bug: 178554651

Change-Id: I813055238bef2dcbdf76172a00b3f44ae940b759