gui_epicmenu.lua: fix epicmenu search showing duplicate result of same oif that option use radiobuttons

and 
erase all mention of 'alloption' table since it was all commented out in https://github.com/ZeroK-RTS/Zero-K/commit/6480c15d53fe78cca4112f627d402346398fd50a 
and (super minor change)
make 'list' and 'radiobutton' handle 'OnChange' similar to other options (for consistency)