Koushoku: fix page selector (#12650)

src/en/koushoku/build.gradle

@@ -5,7 +5,7 @@ ext {
     extName = 'Koushoku'
     pkgNameSuffix = 'en.koushoku'
     extClass = '.Koushoku'
-    extVersionCode = 6
+    extVersionCode = 7
     isNsfw = true
 }
 

src/en/koushoku/src/eu/kanade/tachiyomi/extension/en/koushoku/Koushoku.kt

@@ -158,7 +158,7 @@ class Koushoku : ParsedHttpSource() {
         if (id.isNullOrEmpty())
             throw UnsupportedOperationException("Error: Unknown archive id")
 
-        val url = URL(document.selectFirst(".page img").attr("src"))
+        val url = URL(document.selectFirst(".main img, main img").attr("src"))
         val origin = "${url.protocol}://${url.host}"
 
         return (1..totalPages).map {