Initialize peak controller last sample with base value (#4382)

* Bug fix in peak_controller_effect.cpp

This change makes it so that when an LMMS project is loaded, each knob connected to a Peak Controller will be set to the Peak Controller's Base value, rather than its minimum possible value.
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f