Updates relative center point when using zoom buttons.
Updates relative center point when using zoom buttons.

slashk/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server