fix(buondua): handle single-page URL parsing case (#10714)

- Fix URL extraction when only one page exists

src/all/buondua/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'Buon Dua'
     extClass = '.BuonDua'
-    extVersionCode = 5
+    extVersionCode = 6
     isNsfw = true
 }
 

src/all/buondua/src/eu/kanade/tachiyomi/extension/all/buondua/BuonDua.kt

@@ -96,6 +96,7 @@ class BuonDua() : ParsedHttpSource() {
         // /xiuren-no-10051---10065-1127-photos-467c89d5b3e204eebe33ddbc54d905b1-47452?page=57
         val maxPage = doc.select("nav.pagination:first-of-type a.pagination-next").last()
             ?.absUrl("href")
+            ?.takeIf { it.startsWith("http") }
             ?.toHttpUrl()
             ?.queryParameter("page")?.toInt() ?: 1
         val basePageUrl = response.request.url