Make XCI comply to review and style guidelines

src/core/loader/xci.h

@@ -13,6 +13,7 @@ namespace Loader {
 class AppLoader_XCI final : public AppLoader {
 public:
     explicit AppLoader_XCI(FileSys::VirtualFile file);
+    ~AppLoader_XCI();
 
     /**
      * Returns the type of the file
@@ -30,8 +31,6 @@ public:
     ResultStatus ReadRomFS(FileSys::VirtualFile& dir) override;
     ResultStatus ReadProgramId(u64& out_program_id) override;
 
-    ~AppLoader_XCI();
-
 private:
     FileSys::ProgramMetadata metadata;