Revert "Don't set values per default"

This reverts commit 05785d4.

Author: schinken

src/PPMEncoder.cpp

@@ -19,6 +19,9 @@ void PPMEncoder::begin(uint8_t pin, uint8_t ch) {
   numChannels = ch;
   outputPin = pin;
 
+  for (uint8_t ch = 0; ch < numChannels; ch++) {
+    setChannelPercent(ch, 0);
+  }
 
   TCCR1A = 0;