Fix crash when opening chapter from BrowseSourceScreen (#8657)

app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourceScreen.kt

@@ -256,10 +256,13 @@ data class BrowseSourceScreen(
         }
     }
 
-    private val queryEvent = Channel<SearchType>()
     suspend fun search(query: String) = queryEvent.send(SearchType.Text(query))
     suspend fun searchGenre(name: String) = queryEvent.send(SearchType.Genre(name))
 
+    companion object {
+        private val queryEvent = Channel<SearchType>()
+    }
+
     sealed class SearchType(val txt: String) {
         class Text(txt: String) : SearchType(txt)
         class Genre(txt: String) : SearchType(txt)