Fix a bug where the PAC proxy port is not set correctly. am: 25ef171b68

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23609480

Change-Id: Ie316088e4eb7bfc5255fed345b8e2153b99b93a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>