Fix/chapter list fetch updating and inserting chapters into database (#749)

* Keep initial fetch date of existing chapters on a list fetch

The fetch at date should not get updated for existing chapters.
Updating this field makes it impossible to detect which chapters were actually newly fetched.
To get the last fetched timestamp of the chapters, the "chaptersLastFetchedAt" field of the manga should be used

got changed in 6d33d72663

* Get real chapter url safely

In case this causes an exception, it should not cause the whole list fetch to fail

was removed in 6d33d72663

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/Chapter.kt

@@ -150,7 +150,9 @@ object Chapter {
                     index + 1,
                     now,
                     mangaId,
-                    (source as? HttpSource)?.getChapterUrl(fetchedChapter),
+                    runCatching {
+                        (source as? HttpSource)?.getChapterUrl(fetchedChapter)
+                    }.getOrNull(),
                 )
 
             if (chapterEntry == null) {
@@ -184,7 +186,6 @@ object Chapter {
                         this[ChapterTable.chapter_number] = it.chapterNumber
                         this[ChapterTable.scanlator] = it.scanlator
                         this[ChapterTable.sourceOrder] = it.index
-                        this[ChapterTable.fetchedAt] = it.fetchedAt
                         this[ChapterTable.realUrl] = it.realUrl
                     }
                     execute(this@transaction)