textinput: fix tiv3 leave

[sungyoonc]

Describe your PR, what does it fix/add?

Fix #7757

This MR fixes some mistakes from MR #7660.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

I could make this part a separate MR. Do you prefer that?

if (isV3() && !pV3Input.expired() && pV3Input->current.enabled.value) {
    pV3Input->pending.enabled.value            = false;
    pV3Input->pending.enabled.isDisablePending = false;
    pV3Input->pending.enabled.isEnablePending  = false;
    pV3Input->current.enabled.value            = false;
}

Is it ready for merging, or does it need work?

Ready

[vaxerski]

thanks :)