Skips impact the score for non-everyday habits

[texnic]

Discussed in #1686

I have a "6 times per week" habit. I have reached a 100 % score on it.
Then I skipped 4 days (not missed, but skipped).
In case it matters: I am now at "total" of 218.
Depending on how many days passed since the skipping days, the score changes.
Today is 28 April.
If the skipped days are 25-28 April, the score remains 100 %, as expected.
Skipped 24-27 April, habit done again on 28 April; score 99 %.
Skipped 23-27 April, done again on 27-28 April; score 98 %.
Skipped 22-25 April, done again on 26-28 April; score 98 %.
Skipped 21-24 April, done again on 25-28 April; score 97 %.
And so on. If the skipped days are long in the past, today's score starts increasing again.

The expected behaviour is that the score remains at 100 % in all cases above, since the "skips keep the score unchanged and don't break the streak" (by definition).