Naver Comic: fix page list for mobile user agent (#1272)

src/ko/navercomic/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'Naver Comic'
     extClass = '.NaverComicFactory'
-    extVersionCode = 4
+    extVersionCode = 5
 }
 
 apply from: "$rootDir/common.gradle"

src/ko/navercomic/src/eu/kanade/tachiyomi/extension/ko/navercomic/NaverComicBase.kt

@@ -130,6 +130,13 @@ abstract class NaverComicBase(protected val mType: String) : ParsedHttpSource()
                 .map {
                     it.attr("src")
                 }
+                .ifEmpty {
+                    // for mobile user agent
+                    document.select(".toon_view_lst img")
+                        .map {
+                            it.attr("data-src")
+                        }
+                }
                 .forEach {
                     pages.add(Page(pages.size, "", it))
                 }