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/ResourceFolderModel.h

@@ -261,6 +261,9 @@ void ResourceFolderModel::applyUpdates(QSet<QString>& current_set, QSet<QString>
 
         std::sort(removed_rows.begin(), removed_rows.end());
 
+        for (int i = 0; i < removed_rows.size(); i++)
+            removed_rows[i] -= i;
+
         for (auto& removed_index : removed_rows) {
             beginRemoveRows(QModelIndex(), removed_index, removed_index);