[vfs] remove usage of 'dynamic_cast', use ankerl::map for files (#3594)

Do I need to writeout everything wrong with `dynamic_cast`?

Also the usual std::map -> `ankerl::unordered_dense::map` conversion, seems to work just fine - but of course test that updates/DLCs/mods/cheats/etc are still being applied :)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3594
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/yuzu/bootmanager.cpp

@@ -193,7 +193,7 @@ public:
     }
 
     void SwapBuffers() override {
-        if (auto window = dynamic_cast<QWindow*>(surface)) {
+        if (auto window = static_cast<QWindow*>(surface)) {
             if (!window->isExposed()) {
                 LOG_DEBUG(Frontend, "SwapBuffers ignored: window not exposed");
                 return;