search/kanji: don't transliterate onyomi to katakana

lib/search/kanji_search.dart

@@ -196,10 +196,7 @@ Future<KanjiSearchResult?> searchKanjiWithDbConnection(
     meanings: meanings.map((item) => item['meaning'] as String).toList(),
     kunyomi: kunyomis.map((item) => item['yomi'] as String).toList(),
     parts: parts.map((item) => item['radical'] as String).toList(),
-    onyomi: onyomis
-        .map((item) => item['yomi'] as String)
-        .map(transliterateHiraganaToKatakana)
-        .toList(),
+    onyomi: onyomis.map((item) => item['yomi'] as String).toList(),
     radical: radical,
     codepoints: {
       for (final codepoint in codepoints)