"Burst mistakes" should count as one mistake

[HendrikHuebner]

For example when mashing a key and typing an extra letter, all subsequent letters will be off by one position. Monkeytype counts each letter as a mistake, so you might end up with four or five "mistakes" when mashing a single key. I do like to keep minimum accuracy turned on during tests, but this is very annoying, since a single key-mash often drops my accuracy by several percentage points because of this and therefore the test fails. Missing a single letter or having a single letter to much should be counted as one mistake, when computing total accuracy of the test.