Fix default category showing up in edit manga categories list

Also remove some usages of runBlocking

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -61,6 +61,7 @@ import eu.kanade.tachiyomi.util.system.toast
 import eu.kanade.tachiyomi.widget.materialdialogs.QuadStateTextView
 import eu.kanade.tachiyomi.widget.materialdialogs.await
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import logcat.LogPriority
 import eu.kanade.domain.chapter.model.Chapter as DomainChapter
 
@@ -214,7 +215,7 @@ class MangaController :
                 }
             } else null,
             onRequireCategory = { manga, categories ->
-                val ids = presenter.getMangaCategoryIds(manga)
+                val ids = runBlocking { presenter.getMangaCategoryIds(manga) }
                 val preselected = categories.map {
                     if (it.id in ids) {
                         QuadStateTextView.State.CHECKED.ordinal

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt

@@ -64,7 +64,6 @@ import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.update
-import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.supervisorScope
 import kotlinx.coroutines.withContext
 import logcat.LogPriority
@@ -351,7 +350,7 @@ class MangaPresenter(
      * @return List of categories, not including the default category
      */
     suspend fun getCategories(): List<Category> {
-        return getCategories.await()
+        return getCategories.await().filterNot { it.isSystemCategory }
     }
 
     /**
@@ -360,8 +359,8 @@ class MangaPresenter(
      * @param manga the manga to get categories from.
      * @return Array of category ids the manga is in, if none returns default id
      */
-    fun getMangaCategoryIds(manga: DomainManga): Array<Long> {
-        val categories = runBlocking { getCategories.await(manga.id) }
+    suspend fun getMangaCategoryIds(manga: DomainManga): Array<Long> {
+        val categories = getCategories.await(manga.id)
         return categories.map { it.id }.toTypedArray()
     }