Fix #5603: Game fails on startup (#5604)

The game tries to use a ui context while setting up a platform environment. Let the platform environment be created before looking for the RCT2 directory. This is a bit hacky at the moment, but a necessary fix until it can be cleaned up.

src/openrct2/Context.cpp

@@ -170,6 +170,12 @@ namespace OpenRCT2
                 config_save_default();
             }
 
+            if (!rct2_init_directories() || !rct2_startup_checks())
+            {
+                return false;
+            }
+            _env->SetBasePath(DIRBASE::RCT2, gRCT2AddressAppPath);
+
             if (!gOpenRCT2Headless)
             {
                 GetContext()->GetUiContext()->CreateWindow();