Fixed incorrect unregister from connectivity service am: 7ba0f259 am:...

Fixed incorrect unregister from connectivity service am: 7ba0f259 am: 2271e9f1 am: 00e20463 am: 1bc07bd9

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/1438134

Change-Id: I0ac05ca616b4b40d696a31537d5d184555c6fc74