[clang-tidy] remove redundant access specifiers

Found with readability-redundant-access-specifiers

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/output/plugins/OpenALOutputPlugin.cxx

@@ -70,7 +70,6 @@ private:
 
 	void Cancel() noexcept override;
 
-private:
 	[[nodiscard]] gcc_pure
 	ALint GetSourceI(ALenum param) const noexcept {
 		ALint value;

src/output/plugins/RecorderOutputPlugin.cxx

@@ -87,7 +87,6 @@ private:
 
 	size_t Play(const void *chunk, size_t size) override;
 
-private:
 	[[nodiscard]] gcc_pure
 	bool HasDynamicPath() const noexcept {
 		return !format_path.empty();

src/playlist/plugins/EmbeddedCuePlaylistPlugin.cxx

@@ -60,7 +60,6 @@ public:
 
 	std::unique_ptr<CueParser> parser;
 
-public:
 	std::unique_ptr<DetachedSong> NextSong() override;
 };