AOSP/Messaging - Update language to comply with Android's inclusive language guidance. am: 4b52654e98 am: 8fe5feae57 am: 7c76d237bb

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Messaging/+/1378899

Change-Id: I0a6ebef1ef342258391bddeb34f5cc719ff28449