Fix 'service install' on Mac OS

Without this when cloudflared is started with Mac OS launch agent it errors with:
```
Use `cloudflared tunnel run` to start tunnel {UUID}
Use `cloudflared tunnel run` to start tunnel {UUID}
Use `cloudflared tunnel run` to start tunnel {UUID}
```

This patch is suggested by https://github.com/cloudflare/cloudflared/issues/327#issuecomment-1763670368

cmd/cloudflared/common_service.go

@@ -24,7 +24,8 @@ func getServiceExtraArgsFromCliArgs(c *cli.Context, log *zerolog.Logger) ([]stri
 		// currently, we only support extra args for token
 		return buildArgsForToken(c, log)
 	} else {
-		// empty extra args
-		return make([]string, 0), nil
+		return []string{
+			"tunnel", "run",
+		}, nil
 	}
 }