When the cover is damaged, refresh to get the latest cover (#11146)

* Update cover

* Bump the extension version

src/zh/picacomic/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'Picacomic'
     extClass = '.Picacomic'
-    extVersionCode = 7
+    extVersionCode = 8
     isNsfw = true
 }
 

src/zh/picacomic/src/eu/kanade/tachiyomi/extension/zh/picacomic/Picacomic.kt

@@ -284,6 +284,7 @@ class Picacomic : HttpSource(), ConfigurableSource {
                 .distinct()
                 .joinToString(", ")
             status = if (comic.finished) SManga.COMPLETED else SManga.ONGOING
+            thumbnail_url = comic.thumb.let { "${it.fileServer}/static/${it.path}" }
         }
     }