Removed ALT-D as a full screen toggle option, as this doesn't work in the browser.

Author: lanceewing

core/src/main/java/emu/jvic/ui/MachineInputProcessor.java

@@ -132,7 +132,6 @@ public boolean keyUp(int keycode) {
 
         if (altKeyDown) {
             switch (keycode) {
-                case Keys.D:
                 case Keys.ENTER:
                     handleFullScreenToggle();
                     return true;