Fix #174: Selecting Seekbar to move video time freezes controls

[Geletinousamigo]

• This PR solves the issue caused due to removal of onActionUp(::invoke) from handleDPadKeyEvents Modifier extension fun.

• Also when we first move the focus from play/pause button to VideoPlayerIndicator the focus is moved to right side again because of this condition, when the VideoPlayerIndicator is not selected then it should not override the onLeft and onRight behaviour, focus events are handled properly when the onLeft and onRight is not overrided

    onRight = {
        if (isSelected) {
             seekProgress = (seekProgress + 0.1f).coerceAtMost(1f)
       } else {
            focusManager.moveFocus(FocusDirection.Right)
       }
    }

• Also removed the focusManager.moveFocus(FocusDirection.Exit) called on onSeek event, because the focus was lost from the screen, and came back only when play/pause button was focused again when overlay is visible again

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[chikoski]

LGTM. Thanks for sending the pull request!