common/fs/file: Default initialize IOFile members

Prevents a potential uninitialized read vector in the move constructor.

src/common/fs/file.h

@@ -441,8 +441,8 @@ public:
 
 private:
     std::filesystem::path file_path;
-    FileAccessMode file_access_mode;
+    FileAccessMode file_access_mode{};
-    FileType file_type;
+    FileType file_type{};
 
     std::FILE* file = nullptr;
 };