Fix GtkCalendar on Ambiance and Radiance themes

Please change background-color and padding!
Compare:

http://imgur.com/Lltmknx

CODE:
.menuitem GtkCalendar,
.menuitem GtkCalendar.button,
.menuitem GtkCalendar.header,
.menuitem GtkCalendar.view {
    background-color: transparent;
    background-image: none;
    border-radius: 0;
    border-style: solid;
    border-width: 0;
    padding: 4px;

    color: @dark_fg_color;
}

.menuitem GtkCalendar {
    background-color: shade (@dark_bg_color, 1.3);
    background-image: none;
}

.menuitem GtkCalendar:inconsistent {
    color: shade (@bg_color, 0.6);
}