fixed access after delete

Fixes #1538
Fixes #1541

app/dialog/sequence/presetmanager.h

@@ -124,6 +124,8 @@ public:
 
       preset_file.close();
     }
+
+    qDeleteAll(custom_preset_data_);
   }
 
   QString GetPresetName(QString start) const

app/dialog/sequence/sequencedialogpresettab.cpp

@@ -81,7 +81,7 @@ SequenceDialogPresetTab::SequenceDialogPresetTab(QWidget* parent) :
 
 SequenceDialogPresetTab::~SequenceDialogPresetTab()
 {
-  qDeleteAll(child_presets_);
+  qDeleteAll(default_preset_data_);
 }
 
 void SequenceDialogPresetTab::SaveParametersAsPreset(SequencePreset preset)
@@ -235,8 +235,6 @@ void SequenceDialogPresetTab::AddItemInternal(QTreeWidgetItem *folder, Preset* p
   item->setData(0, kDataPresetIsCustomRole, is_custom);
   item->setData(0, kDataPresetDataRole, index);
 
-  child_presets_.append(preset);
-
   folder->addChild(item);
 }
 

app/dialog/sequence/sequencedialogpresettab.h

@@ -68,8 +68,6 @@ private:
 
   QVector<Preset*> default_preset_data_;
 
-  QVector<Preset*> child_presets_;
-
 private slots:
   void SelectedItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);