Get all mirrors before deleting repo

1. Get ALL mirrors and not just the non-disabled ones.
2. Get them freshly before deleting the repo (in the very rare/should-not-happen
   case that they have changed since the ViewModel was created).

Follow-up to fdroid/fdroidclient!1499

app/src/main/java/org/fdroid/fdroid/views/repos/RepoDetailsViewModel.kt

@@ -61,7 +61,6 @@ class RepoDetailsViewModel(
     }
 
     private val repoId = initialRepo.repoId
-    private val repoMirrors = initialRepo.getMirrors()
 
     private val repoManager = FDroidApp.getRepoManager(app)
     private val appDao = DBHelper.getDb(app).getAppDao()
@@ -104,14 +103,13 @@ class RepoDetailsViewModel(
     }
 
     fun deleteRepository() {
+        val cache = DnsCache.get()
+        val mirrors = repoFlow.value?.getAllMirrors() ?: emptyList()
+        mirrors.forEach { cache.remove(it.url.host) }
+
         viewModelScope.launch(Dispatchers.IO) {
             repoManager.deleteRepository(repoId)
         }
-        // clean up dns cache
-        val cache = DnsCache.get()
-        for (mirror in repoMirrors) {
-            cache.remove(mirror.url.host)
-        }
     }
 
     fun updateUsernameAndPassword(username: String, password: String) {