Enable ktor cio http pipelining

app/src/main/java/com/hippo/ehviewer/EhApplication.kt

@@ -339,6 +339,7 @@ class EhApplication : Application(), DefaultLifecycleObserver, ImageLoaderFactor
                         serverName = "0.0.0.0".takeIf { Settings.getDF() }
                         trustManager = EhX509TrustManager
                     }
+                    pipelining = true
                 }
                 install(HttpCookies) {
                     storage = EhCookieStore