hle/service: Replace log + UNIMPLEMENTED with UNIMPLEMENTED_MSG

Combines the two into one, shortening the amount of code here.

src/core/hle/service/service.cpp

@@ -144,8 +144,7 @@ void ServiceFrameworkBase::ReportUnimplementedFunction(Kernel::HLERequestContext
     }
     buf.push_back('}');
 
-    LOG_ERROR(Service, "unknown / unimplemented {}", fmt::to_string(buf));
-    UNIMPLEMENTED();
+    UNIMPLEMENTED_MSG("Unknown / unimplemented {}", fmt::to_string(buf));
 }
 
 void ServiceFrameworkBase::InvokeRequest(Kernel::HLERequestContext& ctx) {