fix a script error

[commy2]

When merged this pull request will:

• fixes:

 5:09:44   Error ||: Type Display (dialog), expected Bool
 5:09:44 File x\cba\addons\events\fnc_keyHandlerDown.sqf, line 69
 5:09:44 Error in expression <= [_params call _code] param [0, false] || {_blockInput};

Retrun value could be anything and not bool would error.

[_params call _code] param [0, false] isEqualTo true

is essentially:

private _temp = _params call _code;
!isNil "_temp" && {_temp isEqualTo true}

but a bit faster.