Fix adding Seerr server if plugin is not installed (#2179)

## Description
If the server plugin is not installed, trying to add Seerr server will
show an endless loading page. This PR fixes that.

### Related issues
Fixes #2177

### Testing
Emulator against server with & without the plugin

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/ui/setup/seerr/SwitchSeerrViewModel.kt

@@ -52,6 +52,9 @@ class SwitchSeerrViewModel
                         _state.update { it.copy(loading = LoadingState.Success) }
                     }
                 }
+            } else {
+                // Nothing to check so set success
+                _state.update { it.copy(loading = LoadingState.Success) }
             }
         }