[hle] Fix fsp-pr not being found (#4379)

Should be `fsp-pr`, not `fsp:pr`

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

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4379
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Maufeat <sahyno1996@gmail.com>

src/core/hle/service/filesystem/filesystem.cpp

@@ -798,7 +798,7 @@ void LoopProcess(Core::System& system) {
     const auto FileSystemProxyFactory = [&] { return std::make_shared<FSP_SRV>(system); };
 
     server_manager->RegisterNamedService("fsp-ldr", std::make_shared<FSP_LDR>(system));
-    server_manager->RegisterNamedService("fsp:pr", std::make_shared<FSP_PR>(system));
+    server_manager->RegisterNamedService("fsp-pr", std::make_shared<FSP_PR>(system));
     server_manager->RegisterNamedService("fsp-srv", std::move(FileSystemProxyFactory));
     ServerManager::RunServer(std::move(server_manager));
 }