Adapt code style

...c/main/java/de/justjanne/quasseldroid/app/MainActivity.kt

...est/kotlin/de/justjanne/libquassel/client/EndToEndTest.kt

...protocol/serializers/handshake/ClientInitAckSerializer.kt

...ssel/protocol/serializers/primitive/DateTimeSerializer.kt

.../protocol/serializers/primitive/HandshakeMapSerializer.kt

...ssel/protocol/serializers/primitive/DateSerializerTest.kt

.../protocol/serializers/primitive/DateTimeSerializerTest.kt

...serializers/primitive/DccIpDetectionModeSerializerTest.kt

...l/protocol/serializers/primitive/MessageSerializerTest.kt

.../libquassel/protocol/testutil/matchers/TemporalMatcher.kt

...ustjanne/libquassel/protocol/testutil/qtSerializerTest.kt

...in/de/justjanne/libquassel/protocol/types/SignedIdTest.kt