[AboutSystem] Change window title to About Haiku
|Reported by:||deejam||Owned by:||leavengood|
|Has a Patch:||yes||Platform:||All|
"About this system" is renamed to "About Haiku" in Deskbar. Window title should be renamed to "About Haiku" to match the Deskbar name. Maybe the whole component should be renamed to "AboutHaiku" (the binary and sources).