Lint cleanups.

...main/java/org/briarproject/bramble/util/AndroidUtils.java

...t/java/org/briarproject/bramble/api/data/BdfListTest.java

...rc/test/java/org/briarproject/bramble/test/TestUtils.java

...n/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

.../briarproject/bramble/account/AccountManagerImplTest.java

...rg/briarproject/bramble/db/DatabaseComponentImplTest.java

...c/main/java/org/briarproject/briar/android/Localizer.java

...g/briarproject/briar/android/keyagreement/CameraView.java

...ject/briar/android/threaded/ThreadListControllerImpl.java

...oject/briar/introduction/IntroductionIntegrationTest.java

...ivategroup/invitation/GroupInvitationManagerImplTest.java