[volt] remove read_cfg, as its broken. Will not be added again till [issue](flightlessmango/MangoHud#1566) its fixed

Author: pythonlover02

src/gpu_launch.py

@@ -659,7 +659,6 @@ def _generate_render_pipeline_env_vars(render_pipeline_widgets):
                     mangohud_config_parts.append(mapped_value)
 
         if mangohud_config_parts:
-            mangohud_config_parts.insert(0, 'read_cfg')
             config_value = ','.join(mangohud_config_parts)
             env_vars.append(f'MANGOHUD_CONFIG={config_value}')