UploadFilesActivity.onCheckAvailableSpaceFinish: IllegalStateException with fragment manager

### Cause of error
```java
Exception in thread "main" java.lang.IllegalStateException: Fragment IndeterminateProgressDialog{7566bba} (97a1d970-39c3-4cc0-ac54-0e95705a4e8c) not associated with a fragment manager.
at androidx.fragment.app.Fragment.getParentFragmentManager(Fragment.java:1112)
at androidx.fragment.app.DialogFragment.dismissInternal(DialogFragment.java:612)
at androidx.fragment.app.DialogFragment.dismiss(DialogFragment.java:555)
at com.owncloud.android.ui.activity.UploadFilesActivity.onCheckAvailableSpaceFinish(UploadFilesActivity.java:483)
at com.owncloud.android.ui.asynctasks.CheckAvailableSpaceTask.onPostExecute(CheckAvailableSpaceTask.java:58)
at com.owncloud.android.ui.asynctasks.CheckAvailableSpaceTask.onPostExecute(CheckAvailableSpaceTask.java:20)
at android.os.AsyncTask.finish(AsyncTask.java:773)
at android.os.AsyncTask.-$$Nest$mfinish(Unknown Source:0)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:790)
at android.os.Handler.dispatchMessageImpl(Handler.java:142)
at android.os.Handler.dispatchMessage(Handler.java:125)
at android.os.Looper.loopOnce(Looper.java:269)
at android.os.Looper.loop(Looper.java:367)
at android.app.ActivityThread.main(ActivityThread.java:9333)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:566)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:929)

```

### App information
* ID: `tech.shadow.drive.android.client`
* Version: `30290090 (build #22647)`
* Build flavor: `gplay`

### Device information
* Brand: `google`
* Device: `panther`
* Model: `Pixel 7`
* Id: `CP1A.260305.018`
* Product: `panther`

### Firmware
* SDK: `36`
* Release: `16`
* Incremental: `14887507`