fix Manhuaga thumbnail & add icon (#5866)

* fix Manhuaga thumbnail

* manhuaga icon

multisrc/overrides/madara/manhuaga/src/Manhuaga.kt

@@ -0,0 +1,20 @@
+package eu.kanade.tachiyomi.extension.en.manhuaga
+
+import eu.kanade.tachiyomi.multisrc.madara.Madara
+import okhttp3.OkHttpClient
+
+class Manhuaga : Madara("Manhuaga", "https://manhuaga.com", "en") {
+    override val client: OkHttpClient = super.client.newBuilder()
+        .addInterceptor { chain ->
+            val originalRequest = chain.request()
+            chain.proceed(originalRequest).let { response ->
+                if (response.code() == 403) {
+                    response.close()
+                    chain.proceed(originalRequest.newBuilder().removeHeader("Referer").addHeader("Referer", "https://manhuaga.com").build())
+                } else {
+                    response
+                }
+            }
+        }
+        .build()
+}