Fix existing linting problems

app/build.gradle.kts

app/src/main/java/audio/funkwhale/ffa/FFA.kt

.../java/audio/funkwhale/ffa/activities/DownloadsActivity.kt

...n/java/audio/funkwhale/ffa/activities/LicencesActivity.kt

...main/java/audio/funkwhale/ffa/activities/LoginActivity.kt

.../main/java/audio/funkwhale/ffa/activities/MainActivity.kt

...ain/java/audio/funkwhale/ffa/activities/SearchActivity.kt

...n/java/audio/funkwhale/ffa/activities/SettingsActivity.kt

...ain/java/audio/funkwhale/ffa/activities/SplashActivity.kt

...in/java/audio/funkwhale/ffa/adapters/BrowseTabsAdapter.kt

...ain/java/audio/funkwhale/ffa/adapters/DownloadsAdapter.kt

...ain/java/audio/funkwhale/ffa/adapters/FavoritesAdapter.kt

...ava/audio/funkwhale/ffa/adapters/PlaylistTracksAdapter.kt

...c/main/java/audio/funkwhale/ffa/adapters/RadiosAdapter.kt

...c/main/java/audio/funkwhale/ffa/adapters/SearchAdapter.kt

...c/main/java/audio/funkwhale/ffa/adapters/TracksAdapter.kt

...java/audio/funkwhale/ffa/fragments/AddToPlaylistDialog.kt

...main/java/audio/funkwhale/ffa/fragments/AlbumsFragment.kt

.../java/audio/funkwhale/ffa/fragments/AlbumsGridFragment.kt

...rc/main/java/audio/funkwhale/ffa/fragments/FFAFragment.kt