Assign hardcoded value from MustacheDialogRenderer.render() to variable.
Fix its value to properly accommodate short dialog files.
Remove superfluous check on lines 104-105 of mycroft.dialog.init
==== Tech Notes ====
The new dialog logic, which prevents Mycroft from repeating itself, uses
a list of recently-spoken lines from the skill's .dialog files.
The size of this list is capped, currently at 3. However, .dialog files
can be shorter than 3 entries. An offset is used to accommodate this.
In the previous commit, the offset was wrong. Now it's 2.
==== Documentation Notes ====
If presented with a .dialog file containing 4 or more entries,
Mycroft will avoid saying the same one for at least a few rounds. If the
dialog file contains only 3 entries, Mycroft will avoid saying the same
line twice in a row. If only 1-2 entries are present in a .dialog file,
Mycroft will just pick one and say it, without retaining a history.
30bd84bc85