Fix extractNativeLib condition check

Should always extract native lib if it is not an incremental installation.

BUG: 146781591
Test: manual and check that *.so files are extracted.

$ adb install ~/Downloads/megacity.apk
$ adb shell
coral:/ # ls -R /data/app/com.unity.megacity-yNpLT0e2Zslj3bSo1EpYTg\=\=/lib/
/data/app/com.unity.megacity-yNpLT0e2Zslj3bSo1EpYTg==/lib/:
arm64

/data/app/com.unity.megacity-yNpLT0e2Zslj3bSo1EpYTg==/lib/arm64:
libil2cpp.so  libmain.so  libunity.so

Change-Id: I2b3bdf279e5d5f48304ffe10410469d41dc34625