Fix "lost-column" and "lost-offset" rule bug

[4ok]

Now used the following rule: lost-offset: $i/12; and lost-column: $i/12;, but it's not working. Lost module needed rule like that: 1/<NUM_PARTS>.

At this time I see what all rules look like this:

.row__col_sw_<1..12>:nth-child(12n) {
    margin-right: <GUTTER>;
}