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### Preflight Checklist
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* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 9.3.4
* **Operating System:**
  * Arch Linux
* **Last Known Working Electron version:**
  * 9.3.3

### Expected Behavior
```
❱ echo lang: $LANG lc_all: $LC_ALL
lang: en_US.UTF-8 lc_all:
❱ electron9 -i                    
> process.env.LC_ALL
undefined
```

### Actual Behavior
```
❱ echo lang: $LANG lc_all: $LC_ALL
lang: en_US.UTF-8 lc_all:
❱ electron9 -i                    
> process.env.LC_ALL
'en_US'
```

`en_US` is not a valid locale—it has to be `en_US.UTF-8`, however, Electron overrides this, even if `--lang=en_US.UTF-8` is passed or `LC_ALL` is set correctly when invoking Electron. With this invalid value, many C programs fail to run.

### To Reproduce
Run the above commands.

### Additional Information
Problem introduced in  #26242
shell/browser/electron_browser_main_parts.cc
#if defined(OS_MAC)
  FreeAppDelegate();
#endif
  
  
  
  
  
  for (auto iter = destructors_.begin(); iter != destructors_.end();) {
    base::OnceClosure callback = std::move(*iter);
    if (!callback.is_null())
      std::move(callback).Run();
    ++iter;
  }
  
  
  node_env_->env()->set_trace_sync_io(false);
  js_env_->OnMessageLoopDestroying();
  node::Stop(node_env_->env());
  node_env_.reset();
  ElectronBrowserContext::browser_context_map().clear();
  fake_browser_process_->PostMainMessageLoopRun();
  content::DevToolsAgentHost::StopRemoteDebuggingPipeHandler();
}
#if !defined(OS_MAC)
void ElectronBrowserMainParts::PreMainMessageLoopStart() {