I Roved Out: Fix downloads not finishing (#1758)

* Remove unimplemented override method

* Update extVersionCode

src/en/irovedout/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'I Roved Out'
     extClass = '.IRovedOut'
-    extVersionCode = 3
+    extVersionCode = 4
     isNsfw = true
 }
 

src/en/irovedout/src/eu/kanade/tachiyomi/extension/en/irovedout/IRovedOut.kt

@@ -90,8 +90,6 @@ class IRovedOut : HttpSource() {
         return Observable.just(pages)
     }
 
-    override fun pageListRequest(chapter: SChapter): Request = throw UnsupportedOperationException()
-
     override fun pageListParse(response: Response): List<Page> = throw UnsupportedOperationException()
 
     override fun fetchPopularManga(page: Int): Observable<MangasPage> {