refactor: adapt rest of the codebase to the new resource model

In order to access the ModFolderModel from the ModFolderPage, i created
a new m_model for the correct type, shadowing the m_model of type
ResourceFolderModel. This creates two shared_ptr references to the same object,
but since they will have the same lifetime, it doesn't generate a memory
leak.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/minecraft/mod/TexturePackFolderModel.h

@@ -1,13 +1,11 @@
 #pragma once
 
-#include "ModFolderModel.h"
+#include "ResourceFolderModel.h"
 
-class TexturePackFolderModel : public ModFolderModel
+class TexturePackFolderModel : public ResourceFolderModel
 {
     Q_OBJECT
 
 public:
     explicit TexturePackFolderModel(const QString &dir);
-
-    QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
 };