Minor bugfixes

...in/java/de/kuschku/quasseldroid/service/QuasselService.kt

...main/java/de/kuschku/quasseldroid/ui/chat/ChatActivity.kt

.../quasseldroid/ui/chat/buffers/BufferViewConfigFragment.kt

.../kuschku/quasseldroid/ui/chat/input/AutoCompleteHelper.kt

...chku/quasseldroid/ui/chat/messages/MessageListFragment.kt

...de/kuschku/quasseldroid/ui/chat/nicks/NickListFragment.kt

...quasseldroid/ui/clientsettings/app/AppSettingsFragment.kt

...rc/main/java/de/kuschku/quasseldroid/util/AvatarHelper.kt

app/src/main/java/de/kuschku/quasseldroid/util/Patterns.kt

...est/java/de/kuschku/quasseldroid/util/AvatarHelperTest.kt

...main/java/de/kuschku/libquassel/session/SessionManager.kt

...ava/de/kuschku/quasseldroid/viewmodel/QuasselViewModel.kt