VLCMediaLibraryManager: Rename genres getter

SharedSources/MediaLibraryModel/GenreModel.swift

@@ -25,7 +25,7 @@ class GenreModel: MLBaseModel {
     required init(medialibrary: VLCMediaLibraryManager) {
         self.medialibrary = medialibrary
         medialibrary.addObserver(self)
-        files = medialibrary.genre()
+        files = medialibrary.genres()
     }
 
     func append(_ item: VLCMLGenre) {

SharedSources/VLCMediaLibraryManager.swift

@@ -169,7 +169,7 @@ class VLCMediaLibraryManager: NSObject {
         return type == .video ? medialib.videoFiles(with: sort, desc: desc) : medialib.audioFiles(with: sort, desc: desc)
     }
 
-    func genre(sortingCriteria sort: VLCMLSortingCriteria = .default, desc: Bool = false) -> [VLCMLGenre] {
+    func genres(sortingCriteria sort: VLCMLSortingCriteria = .default, desc: Bool = false) -> [VLCMLGenre] {
         return medialib.genres(with: sort, desc: desc)
     }