The previous workaround was introduced to fix fighting using the keypad
in Indy 3. It enforced genering a number on KEYCODE_KP# events even
when KBD_NUM is not set. The issue on AmigaOS is that SDL never reports
KBD_NUM as being set. Instead we get different keycodes depending if
numlock is on or off (e.g. KEYCODE_KP3 and KEYCODE_PAGEDOWN).
The new workaround is to set the KBD_NUM modifier whenever we receive
a KEYCODE_KP# event from SDL. This way we also generate a number, but
in addition this is consistent with the modifier and works with code
that checks the KDB_NUM modifier (such as the GUI code or the AGI
engine).
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