[Android] Refactor the equalizer view models into one

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Thu Jun 19 14:00:21 2025 +0200| [0ce030f33cf65c95906528f82160d16467c5742a] | committer: Nicolas Pomepuy

Refactor the equalizer view models into one

> https://code.videolan.org/videolan/vlc-android/commit/0ce030f33cf65c95906528f82160d16467c5742a
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 .../videolan/vlc/gui/EqualizerSettingsActivity.kt  | 108 +++------------------
 .../videolan/vlc/viewmodels/EqualizerViewModel.kt  | 101 +++++++++++++++++++
 2 files changed, 114 insertions(+), 95 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/0ce030f33cf65c95906528f82160d16467c5742a