Revert addition of "application/zstd" as archive format

autotests/kerfuffle/loadtest.cpp

@@ -238,14 +238,6 @@ void LoadTest::testProperties_data()
                 << false << false << false << false << false << 0 << Archive::Unencrypted
                 << QStringLiteral("simplearchive")
                 << QString();
-
-        /* mimetype "application/zstd" */
-        QTest::newRow("zstd tarball")
-                << QFINDTESTDATA("data/simplearchive.tar.zstd")
-                << QStringLiteral("simplearchive")
-                << false << false << false << false << false << 0 << Archive::Unencrypted
-                << QStringLiteral("simplearchive")
-                << QString();
     } else {
         qDebug() << "zstd executable not found in path. Skipping zstd test.";
     }

plugins/libarchive/CMakeLists.txt

@@ -5,7 +5,7 @@ set(SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES "application/x-tar;application/x-co
 set(SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES "${SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES}application/x-lzma-compressed-tar;application/x-lzip-compressed-tar;application/x-tzo;application/x-lrzip-compressed-tar;application/x-lz4-compressed-tar;")
 set(SUPPORTED_LIBARCHIVE_READONLY_MIMETYPES "application/vnd.debian.binary-package;application/x-deb;application/x-cd-image;application/x-bcpio;application/x-cpio;application/x-cpio-compressed;application/x-sv4cpio;application/x-sv4crc;")
 set(SUPPORTED_LIBARCHIVE_READONLY_MIMETYPES "${SUPPORTED_LIBARCHIVE_READONLY_MIMETYPES}application/x-rpm;application/x-source-rpm;application/vnd.ms-cab-compressed;application/x-xar;application/x-iso9660-appimage;application/x-archive;")
-set(SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES "${SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES}application/zstd;application/x-zstd-compressed-tar;")
+set(SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES "${SUPPORTED_LIBARCHIVE_READWRITE_MIMETYPES}application/x-zstd-compressed-tar;")
 
 set(INSTALLED_LIBARCHIVE_PLUGINS "")
 
@@ -49,7 +49,6 @@ set(SUPPORTED_READWRITE_MIMETYPES
     \"application/x-tzo\",
     \"application/x-lrzip-compressed-tar\",
     \"application/x-lz4-compressed-tar\",
-    \"application/zstd\",
     \"application/x-zstd-compressed-tar")
 
 configure_file(

plugins/libarchive/kerfuffle_libarchive.json.cmake

@@ -134,10 +134,5 @@
         "CompressionLevelDefault": 3,
         "CompressionLevelMax": 22,
         "CompressionLevelMin": 1
-    },
-    "application/zstd": {
-        "CompressionLevelDefault": 3,
-        "CompressionLevelMax": 22,
-        "CompressionLevelMin": 1
     }
 }