Keypad keys and normal keys should always behave the same in Compose

I.e. the keysyms below in the right column should always do the same
as thouse in the left column when using Compose:

    <0>        <KP_0>
    <1>        <KP_1>
    <2>        <KP_2>
    <3>        <KP_3>
    <4>        <KP_4>
    <5>        <KP_5>
    <6>        <KP_6>
    <7>        <KP_7>
    <8>        <KP_8>
    <9>        <KP_9>
    <minus>    <KP_Subtract>
    <plus>     <KP_Add>
    <slash>    <KP_Divide>
    <asterisk> <KP_Multiply>

Signed-off-by: Mike FABIAN <mfabian@redhat.com>