Sigenergy read-only mode switch fix

What's Changed

Bug fixes

• fix(sigenergy): send the REST mode switch alongside MQTT and log both by @springfall2008 in #5692

  In read-only mode, a Sigenergy system that is held in VPP mode now also gets the REST operating-mode switch, as well as the MQTT one. Each outcome is logged on its own line, so the logs show which of the two the system acts on.

Full Changelog: v9.4.4...v9.4.5