-fullscren option for MacOS is no longer supported when building on Java 9+

Currently the client has a `-fullscreen` option for automatically starting the game in fullscreen on macOS. As of java 9+ the current approach we are using will not longer work (the classes used have been removed):
https://github.com/magefree/mage/blob/d42f9f1eca3a734b024e46e78eeadc658106c485/Mage.Client/src/main/java/mage/client/util/MacFullscreenUtil.java#L38-L55

We either need a new method for doing this, or to simply remove the option and require the users to fullscreen the application manually.

Start with Mage.Client/src/main/java/mage/client/util/MacFullscreenUtil.java, especially the Java classes referenced at lines 38-55, and trace how the -fullscreen option invokes them. Check the Java 9+ build or runtime path and determine whether fullscreen can remain supported or the option should be removed; done means the macOS client no longer relies on removed classes and the chosen behavior is clear.

Written by the indexing model from the issue text.