Fixed bad content type in case of uppercase file extension

src/libs/av/impl/AudioFile.cpp

@@ -293,7 +293,7 @@ namespace Av
         // List should be sync with the demuxers shipped in the lms's docker version
         // + the _audioFileExtensions in ScanSettings
         // std::filesystem::path does not seem to have std::hash specialization on freebsd
-        static const std::map<std::filesystem::path, std::string_view> entries
+        static const std::unordered_map<std::string, std::string_view> entries
         {
             {".mp3",    "audio/mpeg"},
             {".ogg",    "audio/ogg"},
@@ -320,7 +320,7 @@ namespace Av
             {".mka",    "audio/x-matroska"},
         };
 
-        auto it{ entries.find(fileExtension) };
+        auto it{ entries.find(StringUtils::stringToLower(fileExtension.string())) };
         if (it == std::cend(entries))
             return "";